definiens: means the gross amount billed or invoiced by LICENSEE or its SUBLICENSEES for ( 1 ) sale, rental, lease, use and/or other disposition of LICENSED PRODUCT and for ( 2 ) any SERVICE performed by LICENSEE or itsSUBLICENSEE, less the following : ( a ) sales, use, occupation, and excise taxes and tariff duties ; ( b ) outboundtransportation prepaid or allowed ; ( c ) discounts allowed in amounts customary in the trade ; and ( d ) amounts allowed orcredited on returns and allowances in lieu of return . No deductions shall be made for commissions paid to individualswhether they are with independent sales agencies or regularly employed by LICENSEE or SUBLICENSEE and on itspayroll, or for costs of collections . LICENSED PRODUCT shall be considered sold, rented, leased, used or otherwisedisposed of when billed out, invoiced, shipped or payment is received, whichever event occurs first