Forum Moderators: buckworks
You need to be able to communicate with some of the major transaction processors and the card associations. Building a gateway from scratch would take probably at least a year if you had the right team.
But it sounds like you might even want to become an Internet payment service provider (IPSP) like (some versions of) Paypal and 2CO. If so, that will even be more difficult, because you need to find a bank willing to back you. Visa / MasterCard are not handing these types of accounts out any longer without a thorough background check as well
-Corey
BUT, I realized that it wasn't worth it considering all the activities you had to duplicate that the gateway provides (receipts, records, refunds, etc.). At $0.10 a txn, a gateway is earning its money.