AT&T Payment API
Tags:att, payment api, at&t
The Payment service is a flexible API-based solution that gives developers and merchants the ability to charge goods and services directly to an AT&T subscriber bill for payment.
Must Register (free until 2/15/2012 using “APIPROMOCODE12” after that $99 annual fee) - https://developer.att.com/developer/join
$100 USD is the maximum available credit/charging capability. Non-U.S. currencies are not supported. (More restrictions on AT&T)