For Cards Vietnam payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
Cards Vietnam Payment Flow
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The customer enters his Email Address (the below page can be skipped by sending the parameter in the payment request).
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The customer has to choose his preferred payment option from the given list.
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The customer needs to enter the necessary credit card information and billing information. Then he needs to confirm the payment.
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The customer receives a message that the payment was successfully processed.
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Upon completion of the payment flow, the customer is redirected back to your ReturnURL.