PayPal is an e-commerce based business that lets users to make and transfer payments electronically. The PayPal Merchant API lets developers integrate its merchant features and functionality with their applications, enabling their clients to have access to, and to manage their PayPal’s merchant account directly. This API is SOAP based.
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The PayPal Merchant PHP SDK by PayPal allows developers to integrate the PayPal Merchant API's functions into their PHP projects and applications. This SDK requires PHP 5.2 or greater and the curl/openssl PHP extensions.