The BitPay PHP Client Library allows developers to integrate the BitPay API's methods into their PHP code. This library is offered under the MIT License.
Cameron and Tyler Winklevoss are placing huge bets on the virtual currency Bitcoin and this week revealed their latest Bitcoin endeavor: an open API for their Bitcoin price index.
Payment options are not limited to cash, checks, or credit cards anymore. ECommerce and mobile tech have transformed the ways people buy goods and services in the past few years. Driving the new options are APIs. Here's a list of top APIs for Payments, according to traffic on ProgrammableWeb.