I am working on integrating this https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/ Into my website. But my question is while using Express Checkout (posted in link) will it trigger an IPN like normal? Because my website currently just uses a normal PayPal button that when payment is complete my IPN listener receives and processes the IPN message. But I am just wondering if after a payment is made through Express Checkout if IPN message gets sent to my IPN listener like normal?
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Yes, Express Checkout triggers an IPN just like any other PayPal transaction, but the txn_type would be different.
If using Express Checkout with a single item the txn_type would be express_checkout. If multiple items are in the Express Checkout payment then it would come through IPN as cart.
More details on that available here: https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id08CTB0S055Z
