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How do I test failed transactions in the PayPal Sandbox?

PayPal's Sandbox allows developers to return failed error codes for AVS, CVV, and other failure results. For the negative testing to work for API response codes, developers need to set the API version in their code to greater than or equal to 2.4.

See Also:
Test your integration
PayPal Sandbox Testing Guide
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Error: Transaction cannot be processed. The merchant’s account is not able to process transactions (2493 views)

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