I'm encountering an issue while testing in the sandbox as a guest. I’ve tried using the following test cards, but I'm receiving the error message: "Things don't appear to be working at the moment. Please try again later." I'm feeling stuck with my testing 3782 8224 6310 005 - American Express 4111 1111 1111 1111 - Visa Some of the test cards I generated using the PayPal sandbox card testing tool https://developer.paypal.com/tools/sandbox/card-testing/#link-testcardnumbers are invalid. However, these two cards are valid but consistently show the same error.
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