When fairly assessed, these fees cover everything from the service provider's cost to issue a monthly statement and provide help desk support, to the cost of supplies or free terminal replacement. Occasionally, when attempting to authorize a transaction, your system may prompt you to call an authorization center to complete the transaction. Or, you may talk to an operator. Card-issuing banks will verify the billing address on a credit card at the time of authorization if a merchant is capable of making the request and does so. If you process any refunds at all, then this pricing policy is important.
Many providers charge on gross sales.
At least one extremely high-profile provider, amazingly, charges on gross sales plus refunds, in effect collecting discount fees on refunds twice.