PayPal REST API
by developer.paypal.com
Currency and finance
Added on February 23rd, 2011
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What it does
The PayPal REST APIs let you accept payments on your site or in your app: create and capture orders, handle subscriptions and recurring payments, issue refunds, send payouts to many recipients and manage invoices. Use the sandbox to test everything with fake accounts first. Responses are JSON. Free to use; PayPal charges a fee per transaction.
More information: https://developer.paypal.com/api/rest/