I just found some negative testing value cannot produce a detail error response, they just said 403 Forbidden. Those value are CARD_EXPIRED, CARD_CLOSED. Is that normal? api i test is /v2/checkout/orders/{orderId}/capture haven't test all value list in https://developer.paypal.com/api/rest/reference/orders/v2/errors/ but INSTRUMENT_DECLINED AGREEMENT_ALREADY_CANCELLED ORDER_NOT_APPROVED MAX_NUMBER_OF_PAYMENT_ATTEMPTS_EXCEEDED TRANSACTION_REFUSED reply well format error message Maybe Paypal already check credit card status, but CARD_EXPIRED, CARD_CLOSED still list in capture order section which make me feel a bit anxious.
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