问题
Can we use data-notify-url attribute to received IPN?
script(src='paypal-button.min.js?merchant=username@email.com', data-button='buynow', data-name='My product', data-amount='1.00', data-env='sandbox', data-notify_url='http://example.com/ipn')
The payment was successful but it seems specified notify_url wasn't called.
I also used Instant Payment Notification (IPN) simulator and enter my notify_url but encountered the error below:
IPN Delivery Failed:503 Service Unavailable
But looking at the logs of my application, I can see the notify_url was called.
I used web accept as transaction type.
回答1:
This just looks like your Backend-Script (may it be PHP or anything else) is currently not available. It can happen due to a server overload.
The 503 is a HTTP-ErrorCode so it has nothing to do with PayPal. PayPal tries to send the IPN to you and your web-server responds with a 503 error.
来源：https://stackoverflow.com/questions/18823436/paypal-javascript-button-data-notify-url-instant-payment-notification