Why did I get API error code 10551?
Issue
PayPal returned API error code 10551 - Transaction refused due to internal security systems.Cause
Internal security systems rejected an attempted Direct Payment transaction.Solution
Ask the customer to provide a different payment method.Note: PayPal doesn't give merchants specific reasons for payment declines. If more information is required, have the buyer contact PayPal Business Support.
Note: See the Developer Portal for a complete list of NVP/SOAP API error codes.
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