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Using correct card info, and supplying the valid CVV, the "Test transaction for ValidateCustomerPaymentProfile." fails with transaction Status: Declined (Card declined by issuer - Contact card issuer to determine reason.) Why is this failing? Contact...

I've been using the sandbox in Live mode, creating customer profiles, payment profiles, auth, authCapture transactions. I decided to try Test mode to verify that one gets transId = 0 for authCapture transactions. After I swiched Test mode off, I star...