we are integrating the Paypal-API for Paypal-Checkout and came about the possebility that Paypal might return a PAYER_ACTION_REQUIRED-error (see https://developer.paypal.com/docs/api/orders/v2/#error-PAYER_ACTION_REQUIRED).
We now want to see if our understanding and implemented handling of this error is correct, but we couldn't find a way to provoke this error intentionally in the sandbox to debug our code. How is it done?
We tried to use a card-number from this page: https://developer.paypal.com/tools/sandbox/card-testing/#rejection-triggers and tried to use a "rejection trigger", but either we get "the name contains invalid characters"- or "the credit-card data is not valid"-messages, but the Paypal-Window is never leaved so none of these errors hits our code.
Any ideas?