The PayPal Invoicing PHP SDK by PayPal allows developers to integrate the PayPal Invoicing API into their PHP projects and applications. This SDK requires PHP 5.2 or greater and the curl/openssl PHP extensions.
PayPal has launched the much anticipated Webhooks support for its Payouts functionality. This allows users to receive notifications on their Webhook URLs for PayPal Payouts transactions. These notifications are currently for status scenarios such as processing, success and denied.
Of all the markets being impacted by the booming API economy, perhaps none has seen as much activity and innovation as the payments space. The past several years have seen the launch of a number of disruptive and successful API-centric upstarts, including Stripe and Balanced. Meanwhile, entrenched players like PayPal and Verifone have responded with new offerings of their own.