Document:

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                                                                    EXHIBIT 10.5

This Convertible Subordinated Promissory Note shall not be sold, offered for
sale, pledged, or hypothecated except as permitted herein. Any attempted
transfer of this Convertible Subordinated Promissory Note in violation of such
terms shall be null and void and of no effect. Neither this Convertible
Subordinated Promissory Note nor the shares of Common Stock into which it is
convertible have been registered under the Securities Act of 1933, as amended
(the "Securities Act"), and neither may be sold unless (i) a registration
statement under the Securities Act is in effect therefor or the Company has
received an opinion of counsel to the effect that registration is not required
under the Securities Act in connection with such sale or (ii) the securities are
sold in accordance with Rule 144 promulgated under the Securities Act.

The payment of principal and interest on this Convertible Subordinated
Promissory Note is subject to certain recoupment provisions set forth in the
Agreement and Plan of Merger, dated as of March 19, 2002, by and among iPayment
Holdings, Inc., iPayment Acquisition Sub, Inc. and E-Commerce Exchange, Inc.

The payment of the debt evidenced hereby is subordinated to all debts of the
maker to BANK OF AMERICA, NA as set forth in a Subordination Agreement dated
March 19, 2002. The payment of the debt evidenced hereby also is subordinated to
all debts of the maker to HARBINGER MEZZANINE PARTNERS, L.P. as set forth in a
Subordination Agreement dated March 19, 2002.

                             iPayment Holdings, Inc.
                Form of Convertible Subordinated Promissory Note

March 19, 2002                                                    $_____________

         iPayment Holdings, Inc., a Tennessee corporation (the "Company"),
hereby promises to pay to the order of ____________ the principal amount of
____________ together with interest thereon calculated from the date hereof in
accordance with the provisions of this Note.

         This Note was issued pursuant to that certain Merger Agreement, dated
as of March 19, 2002, by and among the Company, E-Commerce Exchange, Inc. and
the other parties thereto (as amended or modified from time to time in
accordance with its terms, the "Merger Agreement"), and this Note is one of the
"Notes" referred to in the Merger Agreement. Certain capitalized terms used in
this Note have the meanings set forth in paragraph 10 hereof.

         1. Payment of Interest. Except as otherwise expressly provided in
paragraph 6(b) hereof, interest shall accrue at the rate of ____ percent (____%)
per annum (computed on the basis of a 360-day year and the actual number of days
elapsed in any year) on the unpaid principal amount of this Note (including any

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capitalized interest) outstanding from time to time. Except as otherwise
expressly provided in the next sentence, the Company shall pay to the holder of
this Note all accrued interest on March 31, June 30, September 30 and December
31 of each year while this Note is outstanding, beginning March 31, 2002.
Notwithstanding the foregoing, until March 31, 2005, one-half of the accrued
interest otherwise payable to the holder of this Note on the dates specified
above shall be added to the principal amount of this Note on each of the dates
specified above and shall bear interest at the same rate at which interest is
then accruing on the principal amount of this Note until such interest is paid.
Any accrued interest which is not paid on the date on which it is due and
payable shall bear interest at the same rate at which interest is then accruing
on the principal amount of this Note until such interest is paid. Any accrued
interest which for any reason has not theretofore been paid shall be paid in
full on the date on which the final principal payment on this Note is made.
Interest shall accrue on any principal payment due under this Note (and on any
interest which has not been paid on the date on which it is due and payable)
until such time as payment therefor is actually delivered to the holder of this
Note.

         2. Payment of Principal on Note.

             (a) Maturity Date. The Company shall pay the entire outstanding
principal amount of this Note to the holder of this Note on March 19, 2008,
together with all accrued and unpaid interest on this Note.

             (b) Mandatory Prepayments. The holder or holders of Notes
representing a majority of the aggregate principal amount of the Notes then
outstanding may declare all or any portion of the outstanding principal amount
of the Notes (together with all accrued interest thereon and all other amounts
due and payable with respect thereto) to be immediately due and payable and may
demand immediate payment of all or any portion of the outstanding principal
amount of the Notes (together with all such other amounts then due and payable)
upon the consummation of a Prepayment Event. If the holder or holders of the
Notes demand immediate payment of all or any portion of the Notes, the Company
shall immediately pay to the holders of the Notes all amounts due and payable
with respect to such Notes. The Company shall send written notice to the holders
of the Notes at least ten (10) days prior to the date on which any Prepayment
Event shall take place describing in reasonable detail the material terms and
proposed date of consummation thereof. Except as otherwise provided in this
paragraph 2(b), the Company may not, at any time, prepay all or any portion of
the outstanding principal amount of the Notes. Notwithstanding any provision
contained in this paragraph 2 or otherwise, the holder of this Note may convert
all or any portion of the outstanding principal amount of this Note until such
time as such amount has been paid and delivered to the holder of this Note.

             (c) Reduction in Principal Amount. The principal amount of the
Notes held by each holder (and hence the number of shares of the underlying

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Conversion Stock into which such Notes are convertible) shall be reduced without
further action of the Company or the holder hereof in accordance with the
provisions of Article VIII of the Merger Agreement.

         3. Pro Rata Payment. Except as otherwise expressly provided in this
Note, all payments to the holders of the Notes (whether for principal, interest
or otherwise) shall be made pro rata among such holders based upon the aggregate
unpaid principal amount of the Notes held by each such holder. If any holder of
a Note obtains any payment (whether voluntary, involuntary, by application of
offset or otherwise) of principal, interest or other amount with respect to any
Note in excess of such holder's pro rata share of such payments obtained by all
holders of the Notes (other than as expressly provided herein), by acceptance of
a Note each such holder agrees to purchase from the other holders of the Notes a
participation in the Notes held by them as is necessary to cause such holders to
share the excess payment ratably among each of them as provided in this
paragraph.

         4. Subordination. All payments of principal and interest under this
Note are subject to the provisions of that certain Subordination Agreement dated
as of March 19, 2002 by and among Bank of America, NA, the Company, iPayment
Technologies, Inc., First Acquisition Company and the Noteholders, and that
certain Subordination Agreement dated as of March 19, 2002 by and among
Harbinger Mezzanine Partners, L.P., the Company, iPayment Technologies, Inc.,
First Acquisition, and the Noteholders.

         5. Additional or Replacement Senior Debt and Junior Debt. By accepting
this Note and any payments hereunder, each holder of this Note agrees that the
Company and its Affiliates may incur Qualified Indebtedness and Obligations, and
that all of the indebtedness and obligations now owed or that hereafter may be
owed by the Company to such holder pursuant to this Note, together with any and
all such instruments, documents and agreements hereafter securing such
indebtedness and obligations, shall be junior and subordinate in every respect
(other than with respect to scheduled payments of interest and principal not
made in violation of any subordination agreements or other documents reasonably
requested by such Qualified Lenders) to all Qualified Indebtedness and
Obligations, direct or contingent, now owed or that hereafter may be owed by the
Company and its Affiliates to any Qualified Lender, together with all other
instruments, documents and agreements hereafter securing such Qualified
Indebtedness and Obligations, and that such holder will execute and deliver
promptly all subordination agreements (substantially in the form of the
subordination agreements referred to in paragraph 4 above) and other documents
reasonably requested by such Qualified Lenders to further evidence such
subordination. The Company covenants and agrees with the holder of this Note
that it and its Affiliates shall not incur any indebtedness or obligations other
than (a) Qualified Indebtedness and Obligations, or (b) secured indebtedness or
obligations, but not

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indebtedness for borrowed money, incurred in connection with an acquisition or
similar transaction unless it is junior and subordinate to all obligations
pursuant to this Note and the holder of such indebtedness or obligations
executes and delivers promptly all subordination agreements (substantially in
the form of the subordination agreements dated on or about the date this note is
issued among the Noteholders and certain holders of notes subordinated thereto)
and other documents reasonably requested by the holder of this Note to further
evidence such subordination.

         6. Events of Default

             (a) Definition. For purposes of this Note, an "Event of Default"
shall be deemed to have occurred if:

             (i) the Company fails to pay when due and payable (whether at
maturity or otherwise) the full amount of interest then accrued on any Note or
the full amount of any principal payment on any Note;

             (ii) the Company fails to perform or observe any other provision
contained in the Notes; provided that no Event of Default shall be deemed to
have occurred under this subparagraph (ii) if the Company establishes that (A)
the particular Event of Default has not been caused by knowing or purposeful
conduct by the Company or any Subsidiary, (B) the Company has exercised, and
continues to exercise, best efforts to expeditiously cure the Event of Default
(if cure is possible), and (C) the Event of Default is not material to the
financial condition, operating results, operations, assets or business of the
Company and its Subsidiaries, taken as a whole;

             (iii) any representation or warranty contained in Article V of the
Merger Agreement is false or misleading in any material respect on the date made
and such false or misleading representation or warranty has a material adverse
effect on any holder's investment in the Notes; provided that this subparagraph
6(a)(iii) shall cease to form the basis of an Event of Default after the first
anniversary of the issuance of this Note;

             (iv) the Company or any Subsidiary makes an assignment for the
benefit of creditors or admits in writing its inability to pay its debts
generally as they become due; or an order, judgment or decree is entered
adjudicating the Company or any Subsidiary bankrupt or insolvent; or any order
for relief with respect to the Company or any Subsidiary is entered under the
Federal Bankruptcy Code; or the Company or any Subsidiary petitions or applies
to any tribunal for the appointment of a custodian, trustee, receiver or
liquidator of the Company or any Subsidiary, or of any substantial part of the
assets of the Company or any Subsidiary, or commences any proceeding (other than
a proceeding for the voluntary liquidation and dissolution of any Subsidiary)
relating to the Company or any

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Subsidiary under any bankruptcy reorganization, arrangement, insolvency,
readjustment of debt, dissolution or liquidation law of any jurisdiction; or any
such petition or application is filed, or any such proceeding is commenced,
against the Company or any Subsidiary and either (A) the Company or any such
Subsidiary by any act indicates its approval thereof, consent thereto or
acquiescence therein or (B) such petition, application or proceeding is not
dismissed within sixty (60) days;

             (v) a judgment is rendered against the Company or any Subsidiary
other than in any matter disclosed by the Company in the Merger Agreement that
has a material adverse effect on the financial condition, operating results,
operations, assets or business of the Company and its Subsidiaries taken as a
whole;

             (vi) the Company or any Subsidiary defaults in the performance of
any obligation if the effect of such default is (A) to cause or result in
indebtedness or obligations owed to Bank of America, NA, Harbinger or any other
Qualified Lender to become due prior to its stated maturity or (B) to cause a
material adverse effect on the financial condition, operating results,
operations, assets or business of the Company and its Subsidiaries taken as a
whole; or

             (vii) a representative designated pursuant to the Voting Agreement
by the holder or holders of Notes representing a majority of the aggregate
principal amount of Notes then outstanding fails to be duly elected to the
Company's Board of Directors or is removed from the Company's Board of Directors
(other than by such holder or holders).

The foregoing shall constitute Events of Default whatever the reason or cause
for any such Event of Default and whether it is voluntary or involuntary or is
effected by operation of law or pursuant to any judgment, decree or order of any
court or any order, rule or regulation of any administrative or governmental
body.

             (b) Consequences of Events of Default.

                 (i) If any Event of Default of the type described in
subparagraph 6(a)(i) or 6(a)(ii) has occurred and continued for fifteen (15)
days or any other Event of Default has occurred, the interest rate on the Notes
shall increase immediately by an increment of two (2) percentage points (2%).
Thereafter, until such time as no Event of Default exists, the interest rate
shall increase automatically at the end of each succeeding 30-day period by an
additional increment of one (1) percentage points (1%) (but in no event shall
the interest rate exceed 10%). Any increase of the interest rate resulting from
the operation of this subparagraph shall terminate as of the close of business
on the date on which no Event of Default exists (subject to subsequent increases
pursuant to this subparagraph).

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                 (ii) If an Event of Default of the type described in
subparagraph 6(a)(iv) has occurred, the aggregate principal amount of the Notes
(together with all accrued interest thereon and all other amounts due and
payable with respect thereto) shall become immediately due and payable without
any action on the part of the holders of the Notes, and the Company shall
immediately pay to the holders of the Notes all amounts due and payable with
respect to the Notes.

                 (iii) If any Event of Default of the type described in
subparagraph 6(a)(i) has occurred and continued for fifteen (15) days or any
other Event of Default (other than under subparagraph 6(a)(ii) or 6(a)(iv)) has
occurred, the holder or holders of Notes representing a majority of the
aggregate principal amount of Notes then outstanding may declare all or any
portion of the outstanding principal amount of the Notes (together with all
accrued interest thereon and all other amounts due and payable with respect
thereto) to be immediately due and payable and may demand immediate payment of
all or any portion of the outstanding principal amount of the Notes (together
with all such other amounts then due and payable) owned by such holder or
holders. The Company shall give prompt written notice of any such demand to the
other holders of Notes, each of which may demand immediate payment of all or any
portion of such holder's Note. If any holder or holders of the Notes demand
immediate payment of all or any portion of the Notes, the Company shall
immediately pay to such holder or holders all amounts due and payable with
respect to such Notes.

                 (iv) Each holder of the Notes shall also have any other rights
which such holder may have been afforded under any contract or agreement at any
time and any other rights which such holder may have pursuant to applicable law.

                 (v) The Company hereby waives diligence, presentment, protest
and demand and notice of protest and demand, dishonor and nonpayment of this
Note, and expressly agrees that this Note, or any payment hereunder, may be
extended from time to time and that the holder hereof may accept security for
this Note or release security for this Note, all without in any way affecting
the liability of the Company hereunder.

         7. Conversion.

            (a) Conversion Procedure.

                (i) At any time and from time to time after the first
anniversary of the Closing Date or, if earlier, upon the occurrence of a
Liquidity Event, and prior to the payment of this Note in full, the holder of
this Note may convert all or any portion of the outstanding principal amount of
this Note (other than in the case of Liquidity Events that are Co-Sale
Opportunities, in which case the holder may convert only that portion of the
outstanding principal amount of this Note (not to exceed 80% of the initial
principal amount) necessary to obtain the

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number of shares of Conversion Stock such holder will sell in the Co-Sale
Opportunity) into a number of shares of the Conversion Stock (excluding any
fractional share) determined by dividing the principal amount designated by such
holder to be converted by the Conversion Price then in effect.

                (ii) Except as otherwise expressly provided herein, each
conversion of this Note shall be deemed to have been effected as of the close of
business on the date on which this Note has been surrendered for conversion at
the principal office of the Company. At such time as such conversion has been
effected, the rights of the holder of this Note as such holder to the extent of
the conversion shall cease, and the Person or Persons in whose name or names any
certificate or certificates for shares of Conversion Stock are to be issued upon
such conversion shall be deemed to have become the holder or holders of record
of the shares of Conversion Stock represented thereby.

                (iii) Notwithstanding any other provision hereof, if a
conversion of any portion of this Note is to be made in connection with a sale
of the Company or any other event specified by the holder hereof, the conversion
of any portion of this Note may, at the election of the holder hereof, be
conditioned upon the consummation of such sale of the Company or other event, in
which case such conversion shall not be deemed to be effective until the
consummation of such transaction or other event.

                (iv) As soon as possible after a conversion has been effected
(but in any event within three (3) business days in the case of clause (A)
below), the Company shall deliver to the converting holder:

                     (A) a certificate or certificates representing the number
of shares of Conversion Stock (excluding any fractional share) issuable by
reason of such conversion in such name or names and such denomination or
denominations as the converting holder of this Note has specified;

                     (B) payment in an amount equal to the sum of all accrued
interest with respect to the principal amount converted, which has not been paid
prior thereto, plus the amount payable under subparagraph (v) below; and

                     (C) a new Note representing any portion of the principal
amount which was represented by the Note surrendered to the Company in
connection with such conversion but which was not converted.

                (v) If any fractional share of Conversion Stock would, except
for the provisions hereof, be deliverable upon conversion of this Note, the
Company, in lieu of delivering such fractional share, shall pay an amount equal
to such fraction multiplied by the Conversion Price then in effect.

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                (vi) The issuance of certificates for shares of Conversion Stock
upon conversion of this Note shall be made without charge to the holder hereof
for any issuance tax in respect thereof or other cost incurred by the Company in
connection with such conversion and the related issuance of shares of Conversion
Stock. Upon conversion of this Note, the Company shall take all such actions as
are necessary in order to insure that the Conversion Stock issuable with respect
to such conversion shall be validly issued, fully paid and nonassessable.

                (vii) The Company shall not close its books against the transfer
of Conversion Stock issued or issuable upon conversion of this Note in any
manner which interferes with the timely conversion of this Note. The Company
shall assist and cooperate with any holder of this Note required to make any
governmental filings or obtain any governmental approval prior to or in
connection with the conversion of this Note (including, without limitation,
making any filings required to be made by the Company or the holder of this
Note), provided that the holder of this Note shall be responsible for paying all
costs, including any filing fees, in connection therewith.

                (viii) The Company shall at all times reserve and keep available
out of its authorized but unissued shares of Conversion Stock, solely for the
purpose of issuance upon the conversion of the Note, such number of shares of
Conversion Stock issuable upon the conversion of all outstanding Notes. All
shares of Conversion Stock which are so issuable shall, when issued, be duly and
validly issued, fully paid and nonassessable and free from all taxes, liens and
charges. The Company shall take all such actions as may be necessary to assure
that all such shares of Conversion Stock may be so issued without violation of
any applicable law or governmental regulation or any requirements of any
domestic securities exchange upon which shares of Conversion Stock may be listed
(except for official notice of issuance which shall be immediately delivered by
the Company upon each such issuance).

                       (b) Conversion Price. The initial Conversion Price shall
be $10.71428. In order to prevent dilution of the conversion rights granted
under the Notes, the Conversion Price shall be subject to adjustment from time
to time to the extent provided in this paragraph 7.

                       (c) Subdivision or Combination of Common Stock. If the
Company at any time subdivides (by any stock split, stock dividend or otherwise)
one or more classes of its outstanding shares of Common Stock into a greater
number of shares, the Conversion Price in effect immediately prior to such
subdivision shall be proportionately reduced, and if the Company at any time
combines (by reverse stock split or otherwise) one or more classes of its
outstanding shares of Common Stock into a smaller number of shares, the
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

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                       (d) Reorganization, Reclassification, Consolidation,
Merger or Sale. Prior to the consummation of any Organic Change, the Company
shall make lawful and adequate provision (in form and substance satisfactory to
the holders of a majority of the principal amount of the Notes then outstanding)
to insure that each of the holders of the Notes shall thereafter have the right
to acquire and receive, in lieu of or addition to (as the case may be) shares of
Conversion Stock immediately thereto-fore acquirable and receivable upon the
conversion of such holder's Note, such shares of stock, securities or assets as
may be issued or payable with respect to or in exchange for the number of shares
of Conversion Stock immediately theretofore acquirable and receivable upon
conversion of such holder's Note had such Organic Change not taken place. In any
such case, appropriate provision (in form and substance satisfactory to the
holders of a majority of the principal amount of the Notes then outstanding)
shall be made with respect to such holder's rights and interests to insure that
the provisions of this paragraph 7 shall thereafter be applicable in relation to
any shares of stock, securities or assets thereafter deliverable upon the
conversion of the Notes (including, in the case of any such consolidation,
merger or sale in which the successor entity or purchasing entity is other than
the Company, an immediate adjustment of the Conversion Price to the value for
the Common Stock reflected by the terms of such consolidation, merger or sale,
and a corresponding immediate adjustment in the number of shares of Conversion
Stock acquirable and receivable upon conversion of the Notes, if the value so
reflected is less than the Conversion Price in effect immediately prior to such
consolidation, merger or sale). The Company shall not effect any such
consolidation, merger or sale, unless prior to the consummation thereof, the
successor entity (if other than the Company) resulting from consolidation or
merger or the entity purchasing such assets assumes by written instrument (in
form reasonably satisfactory to the holders of a majority of the principal
amount of the Notes then outstanding), the obligation to deliver to each such
holder such shares of stock, securities or assets as, in accordance with the
foregoing provisions, such holder may be entitled to acquire.

                       (e) Notices.

                           (i) Immediately upon any adjustment of the Conversion
Price, the Company shall send written notice thereof to the holder of this Note,
setting forth in reasonable detail and certifying the calculation of such
adjustment.

                           (ii) The Company shall send written notice to the
holder of this Note at least twenty (20) days prior to the date on which the
Company closes its books or takes a record (A) with respect to any dividend or
distribution upon the Common Stock, (B) with respect to any pro rata
subscription offer to holders of Common Stock or (C) for determining rights to
vote with respect to any Organic Change, dissolution or liquidation.

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                           (iii) The Company also shall send written notice to
the holder of this Note at least twenty (20) days prior to the date on which any
Organic Change, dissolution or liquidation shall take place.

                           (iv) The Company also shall send written notice to
the holder of this Note at least twenty (20) days prior to the date on which the
Company declares a dividend upon the Common Stock payable otherwise than in cash
out of earnings or earned surplus (determined in accordance with generally
accepted accounting principles, consistently applied) except for a stock
dividend payable in shares of Common Stock.

                           (v) The Company also shall send written notice to the
holder of this Note at least twenty (20) days prior to the date on which the
Company grants, issues or sells any Options, Convertible Securities or rights to
purchase stock, warrants, securities or other property pro rata to the record
holders of any class of Common Stock.

         8. Transfer. No holder of this Note shall sell, transfer or assign any
interest in this Note except to any Affiliate of such holder without the consent
of the Company (which consent shall not be unreasonably withheld or denied).

         9. Amendment and Waiver. Except as otherwise expressly provided herein,
the provisions of the Notes may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the holders of a
majority of the outstanding principal amount of the Notes.

         10. Definitions. For purposes of the Notes, the following capitalized
terms have the following meaning.

             "Affiliate" means of any particular Person means any other Person
controlling, controlled by or under common control with such particular Person,
where "control" means the possession, directly or indirectly, of the power to
direct the management and policies of a Person whether through the ownership of
voting securities, contract or otherwise.

             "Common Stock" means the Company's Common Stock, no par value.

             "Convertible Securities" means any stock or securities (directly or
indirectly) convertible into or exchangeable for Common Stock.

             "Conversion Stock" means shares of the Company's authorized but
unissued Common Stock; provided that if there is a change such that the
securities issuable upon conversion of the Notes are issued by an entity other
than the Company or there is a change in the class of securities so issuable,
then the term "Conversion Stock" shall mean one share of the security issuable
upon conversion of

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this Note if such security is issuable in shares, or shall mean the smallest
unit in which such security is issuable if such security is not issuable in
shares.

             "Co-Sale Opportunity" means the delivery by any Selling Shareholder
of a Co-Sale Notice (as such terms are defined in the iPayment Holdings, Inc.
Right of First Refusal and Co-Sale Agreement, dated as of April 12, 2001, by and
among the Company and the Persons identified on the exhibits thereto, as amended
by Amendment No. 1 to the Right of First Refusal and Co-Sale Agreement, dated as
of March 19, 2002 (as so amended, the "Co-Sale Agreement")).

             "Liquidity Event" means any liquidation, dissolution and winding up
of the Company, any Prepayment Event, any sale or transfer of all or
substantially all of the assets of the Company and its Subsidiaries on a
consolidated basis (computed on the basis of the greater of (i) book value in
accordance with generally accepted accounting principles consistently applied or
(ii) fair market value determined in the reasonable good faith judgment of the
Company's Board of Directors) in any transaction or series of related
transactions (other than sales of inventory in the ordinary course of business),
any redemption or repurchase of capital stock representing a majority of the
voting power of the outstanding shares of capital stock of the Company, any
public offering of the Company's capital stock, any Co-Sale Opportunity or any
Organic Change.

             "Noteholders" means those persons whose names are set forth in
Exhibit A to this Note.

             "Options" means any rights or options to subscribe for or purchase
Common Stock or Convertible Securities.

             "Organic Change" means any recapitalization, reorganization,
reclassification, consolidation, merger, sale of all or substantially all of the
Company's assets or other transaction, which in each case is effected in such a
manner that holders of Common Stock are entitled to receive (either directly or
upon subsequent liquidation) stock, securities or assets with respect to or in
exchange for Common Stock.

             "Person" means an individual, a partnership, a corporation, a
limited liability company, an association, a joint stock company, a trust, a
joint venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

             "Prepayment Event" means (i) any sale of the Company to any Person
or group of Persons (as the term "group" is used under the Securities Exchange
Act of 1934) pursuant to which such Person or Persons acquire (x) capital stock
of the Company possessing the voting power (under ordinary circumstances) to
elect a majority of the Company's board of directors or more than fifty percent
(50%) of the

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Company's issued and outstanding Common Stock (whether by merger, consolidation
or the sale of the Company's capital stock or otherwise) or (y) all or
substantially all of the Company's assets determined on a consolidated basis; or
(ii) any sale, transfer or issuance or series of sales, transfers and/or
issuances of the Company's capital stock by the Company or any holders thereof
which results in any Person or group of Persons, other than the holders of the
Company's Common Stock and the holders of the Notes immediately following the
consummation of the transactions contemplated by the Merger Agreement, owning
capital stock of the Company possessing the voting power (under ordinary
circumstances) to elect a majority of the Company's board of directors or more
than fifty percent (50%) of the Company's issued and outstanding Common Stock;
provided that a Prepayment Event shall not be deemed to have occurred if any of
the foregoing transactions occurs as a result of (i) Greg Daily being issued
equity incentives by the Company or (ii) other equity investments made by Greg
Daily, each as approved by the Company's Board of Directors.

             "Qualified Indebtedness and Obligations" means all indebtedness for
borrowed money, and all obligations arising out of or related to such
indebtedness, directly or indirectly, contingent or otherwise, of the Company to
any Qualified Lender which have been approved by the Board of Directors of the
Company and which is not convertible into equity securities of the Company,
including without limitation the current indebtedness and obligations of the
Company to Bank of America, NA and Harbinger Mezzanine Partners, L.P., and all
renewals, increases, amendments to and replacements thereof.

             "Qualified Lender" means any nationally, regionally or locally
recognized bank, savings and loan or other financial institution, institutional
lender, mezzanine lender, investment bank, investment company, investment group,
venture capital firm or venture capital group, including without limitation Bank
of America, NA and Harbinger Mezzanine Partners, L.P. Notwithstanding the
foregoing, any entity that is formed solely to make an investment in the Company
shall not be deemed to be a Qualified Lender.

             "Subsidiary" means, with respect to any Person, any corporation,
limited liability company, partnership, association or other business entity of
which (i) if a corporation, a majority of the total voting power of shares of
stock entitled (without regard to the occurrence of any contingency) to vote in
the election of directors, managers or trustees thereof is at the time owned or
controlled, directly or indirectly, by that Person or one or more of the other
Subsidiaries of that Person or a combination thereof, or (ii) if a limited
liability company, partnership, association or other business entity, a majority
of the partnership or other similar ownership interest thereof is at the time
owned or controlled, directly or indirectly, by any Person or one or more
Subsidiaries of that Person or a combination thereof. For purposes hereof, a
Person or Persons shall be deemed to have a majority

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<PAGE>

ownership interest in a limited liability company, partnership, association or
other business entity if such Person or Persons shall be allocated a majority of
limited liability company, partnership, association or other business entity
gains or losses or shall be or control any managing director or general partner
of such limited liability company, partnership, association or other business
entity.

             "Voting Agreement" means the Voting Agreement, dated as of April
12, 2001, by and among the Company and the parties listed on the signature pages
thereto, as amended by Amendment No. 1 to the Voting Agreement, dated as of
March 19, 2002.

         11. Cancellation. After all principal and accrued interest at any time
owed on this Note has been paid in full, this Note shall be surrendered to the
Company for cancellation and shall not be reissued.

         12. Payments. All payments to be made to the holders of the Notes shall
be made in the lawful money of the United States of America in immediately
available funds.

         13. Place of Payment. Payments of principal and interest shall be
delivered to the holder of this Note at the following address:

                                 --------------

or to such other address or to the attention of such other person as specified
by prior written notice to the Company.

         14. Business Days. If any payment is due, or any time period for giving
notice or taking action expires, on a day which is a Saturday, Sunday or legal
holiday in the State of Tennessee or the State of California, the payment shall
be due and payable on, and the time period shall automatically be extended to,
the next business day immediately following such Saturday, Sunday or legal
holiday, and interest shall continue to accrue at the required rate hereunder
until any such payment is made.

                                       13
<PAGE>

         IN WITNESS WHEREOF, the Company has executed and delivered this Note on
the date first written above.

                                                    iPAYMENT HOLDINGS, INC.

                                                    By:
                                                       -------------------------

                                                    Its:
                                                        ------------------------

Accepted and Agreed:

----------------------------------------

By:
   -------------------------------------

Its:
    ------------------------------------
Date:    March 19, 2002

                                       14<PAGE>
                                                                    Exhibit 10.6

The payment of the debt evidenced hereby is subordinated to all debts of the
maker to 1) BANK OF AMERICA, N.A. as set forth in a Subordination Agreement
dated November 6, 2002, 2) HARBINGER MEZZANINE PARTNERS, L.P. as set forth in a
Subordination Agreement dated November 6, 2002, and 3) SUMMIT VENTURES V, L.P.,
SUMMIT VENTURES V COMPANION FUND, L.P., SUMMIT V ADVISORS FUND, L.P., SUMMIT V
(QP) ADVISORS FUND, L.P., SUMMIT INVESTORS III, L.P., RANDOLPH STREET PARTNERS,
RANDOLPH STREET PARTNERS 1998 DIF, LLC and SYCR INVESTMENT FUND I, LLC as set
forth in Subordination Agreement dated November 6, 2002.

                     FORM OF SUBORDINATED PROMISSORY NOTE

_________________, 2002                                        $________________

     FOR VALUE RECEIVED, the undersigned, iPayment, Inc. a Delaware corporation
("Maker"), successor by merger to iPayment Holdings, Inc., promises to pay to
the order of _________________________ ("Lender"), the principal sum of_________
_____________ Dollars ($___________) together with interest on the outstanding
principal balance at the rate of twelve percent (12%) per annum. Interest shall
be paid in arrears on the first business day of each month, beginning on
December 1, 2002. The outstanding principal balance together with any accrued
but unpaid interest shall be payable in full on April 1, 2004 (the "Maturity
Date").

     Both principal and interest due on this Note are payable at Nashville,
Tennessee, in lawful money of the United States of America, or at such other
address as Lender or any subsequent holder of this Note (herein "Holder") may
designate in writing from time to time.

     1.   PREPAYMENTS. The indebtedness evidence hereby may be prepaid without
penalty in whole or in part at Maker's election, at any time from time to time.

     2.   WAIVER OF PRESENTMENT. The Maker, for itself and its heirs, legal
representatives and assigns, waives demand, presentment for payment, notice of
dishonor, protest, notice of protest, and diligence in collection and all other
notices or demands whatsoever with respect to this Note or the enforcement
hereof. This Note may not be changed orally, but only by an agreement in
writing signed by the party against whom enforcement of any waiver, change,
modification or discharge is sought.

     3.   MAXIMUM INTEREST RATE. Holder shall never be entitled to receive,
collect, reserve or apply as interest any amount in excess of the maximum rate
of interest permitted to be charged by applicable law or regulations, as
amended or enacted from time to time.

     4.   GOVERNING LAW. This Note has been executed and delivered in, and
shall be governed by and construed according to the laws of the State of
Tennessee except to the extent preempted by applicable laws of the United
States of America.
<PAGE>
     5.   SUCCESSORS AND ASSIGNS.  As used herein, the terms "Maker" and
"Holder" shall be deemed to include their respective successors, legal
representatives and assigns, whether by voluntary action of the parties or by
operation of law. All of the covenants, a stipulations, promises and agreements
in this Note contained by or on behalf of Maker shall bind its successors and
assigns, whether so expressed or not.

     6.   HEADINGS; CONSTRUCTION.  The headings of the sections of this Note are
inserted for convenience only and shall not be deemed to constitute a part
hereof, words used herein of any gender shall be construed to include any other
gender where appropriate, and words used herein which are either singular or
plural shall be construed to include the other where appropriate.

     7.   AMENDMENTS.  This Note may not be changed or terminated without the
prior written approval of Holder and Maker. No waiver of any term or provisions
hereof shall be valid unless in writing signed by Holder.

     8.   DEFAULT.  Time is of the essence of this Note. It is hereby expressly
agreed that in the event that any default be made in the payment of any part of
interest or principal in accordance with the terms hereof, or upon failure of
the undersigned to keep and perform all the covenants, promises, agreements,
conditions and provisions of this Note or in any other instrument or document
now or hereafter evidencing, securing or otherwise relating to the indebtedness
evidenced hereby, then, in any such case, the entire unpaid principal sum
evidenced by this Note, together with all accrued interest, shall, at the option
of any Holder, without notice, become due and payable forthwith, regardless of
the stipulated maturity date. Notwithstanding the foregoing, the Maker shall not
be in default under the terms of this Note if any payment of principal or
interest is made within three (3) business days after the date on which such
payment is due.

     9.   ATTORNEY'S FEES.  It is expressly understood and agreed by Maker that
if it is necessary to enforce payment of this Note through an attorney or by
suit, Maker shall pay reasonable attorney's fees, court costs and all other
costs of collection.

     10.  SUBORDINATION.  By accepting this Note and payments hereunder, Holder
hereby acknowledges and agrees that payment of principal and/or interest on this
Note are subject to the terms and conditions set forth in those certain
Subordination Agreements by and among Maker, Holder and those lenders set forth
at the top of the first page of this Note.

     IN WITNESS WHEREOF, this Note has been duly executed by the undersigned as
of the day and year first above written.

                                        iPAYMENT, INC.

                                        /s/ Gregory S. Daily
                                        ---------------------------------
                                        Gregory S. Daily,
                                        Chief Executive Officer

                                      -2-

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