If you go to WooCommerce > Status > Logs, and from the dropdown, choose your latest log that starts with woocommerce-payments...
, is there anything in there that looks like this?
2020-08-06T16:07:26+00:00 INFO REQUEST GET https://public-api.wordpress.com/wpcom/v2/sites/%s/wcpay/payment_methods?test_mode=1&customer=cus_XXXXXXXXXXX&type=card&limit=100
2020-08-06T16:07:26+00:00 ERROR Error: No such customer: 'cus_XXXXXXXXXXX' (resource_missing)
Or any other errors?
If you don’t have any logs that start with woocommerce-payments
, you might need to enable the debug log first:
https://docs.woocommerce.com/document/payments/#section-16
… then trigger the error again on purpose to get more information to show in the logs.
I’m thinking it might be this bug:
https://github.com/Automattic/woocommerce-payments/issues/818
… but the log messages can confirm that for us.