The Authorize.Net PHP SDK lets developers integrate their PHP websites or applications with the Authorize.Net API. The SDK enables them to authorize payments on their PHP applications using Authorize.Net services.
2Checkout, a worldwide leader in payment services, has released a new Payment API. The API allows online merchants to integrate 2Checkout’s payment processing engine directly into third party websites. Because the API is directly integrated with third party websites, merchants can maintain a customized user experience that best suits business needs.