These card numbers will always create APPROVED payments and APPROVED refunds in sandbox: Card NumberĬreating a refund may still cause an error if the refund amount is more than the payment amount. Changing accepted cards in Merchant Settings will affect the behavior of the test card numbers.5555 5555 5555 4444 is the simplest card number to use when testing APPROVED payments.All transaction amounts used are in the smallest unit of your currency.
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