Many acquirers require a separate merchant number for e-Commerce transactions because of the need to submit additional data elements with the transaction such as:
The universal resource indicator (URL)
The merchant customer service contact
The merchant phone number
A separate merchant number ensures that other types of credit card activity (non-e-Commerce) accepted by the merchant is not subject to the same scrutiny by the card associations as an e-Commerce transaction. However, this may require an additional Fusebox terminal or site ID to accomplish depending on the TPP.