If you are looking to learn how to integrate PayPal’s REST API in a Wix site see below for video link.
The video covers how to:
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Create an app on your PayPal Developer Dashboard
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Get an access token
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Make a call to PayPal’s Order endpoint to get the redirect URL
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Capture the payment after the buyer authorizes it
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Setup a webhook to receive approved orders from the paypal api
To receive live transactions create a ’ Live ’ app on your PayPal developer dashboard and remove ’ .sandbox ’ from the URLs used in the post requests.
Video Tutorial: click here
I do not go into the depth of explaining everything so if you wish to learn more then you can read the documentation here: https://developer.paypal.com/docs/api/overview/