show payment receipt in woocommerce thankyou page with custom payment gateway?

You can try and use the WC session:

Documentation URL:
https://docs.woocommerce.com/wc-apidocs/class-WC_Session.html

StackOverflow discussion.
https://stackoverflow.com/questions/27199656/how-to-use-session-in-woocommerce-pages-like-we-use-normal-php-session

And once you get to the Thank you page you’ll destroy it.

Haven’t tried it yet by coding it but that should work.

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