Root Cause

• Unsupported payment method selected: The chosen payment option is not enabled or supported by the payment gateway or merchant account.

• Unsupported transaction type: The transaction type (e.g., recurring payment, international payment) is not allowed under the current merchant configuration.

• Payment gateway restrictions: The payment processor or gateway does not support the selected currency, region, or transaction type.

• Incorrect gateway configuration: The merchant's account is not set up to accept the chosen payment method or transaction type.

• Payment method expired or restricted: The customer's selected wallet or card is no longer active or has been limited by the issuer.

Troubleshooting and Solutions

• Verify and update the payment gateway configuration to ensure all desired payment methods and transaction types are enabled.

• Check if the selected transaction type (e.g., recurring, one-time, international) is supported by the payment gateway and merchant account.

• If the issue persists, advise the customer to choose a different, supported payment method to complete the transaction.

• Reach out to the payment gateway to explore if there is a need to enable additional payment methods or transaction types.

• Suggest the customer contact their bank to understand the reason for the decline and resolve any account restrictions.

• Clearly display supported payment methods during checkout to guide customers and prevent transaction failures.