The Heartland PHP Sample Code by Secure Submit demonstrates how to pay for invoice, sign up for recurring payments, and integrate PayPal. Point of sale, master pass, and tokenize available as resources.
At Google I/O, the developer conference in San Francisco taking place this week, the search giant announced a Siri-like service, Google Now. Users can ask questions and get answers directly in what they call "smart cards." Those cards, with flight delays and sports scores, update automatically. And you'd better believe that within each of these cards is an API call.
In preparation for this month's change to Automated Clearing House rules, Dwolla is updating its white label API to allow customers to opt-in (on a transaction by transaction basis) to an ACH option that specifies how a transaction should settle on the same day (provided other conditions are met).
OFX, a foreign currency exchange company, last week announced that its OFX Developers program has exited beta and is now open to all developers. OFX Developers offers a Payments API that gives developers 24/7 access to the global currency markets at rates more competitive than banks'.