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Why did I get API error code 10602?

Issue
PayPal returned API error code 10602 - Authorization completed.

Cause
The authorization has already been completed. The following API calls can produce this error: DoAuthorization, DoCapture, DoReauthorization, and DoVoid.

Solution
Use the GetTransactionDetails API call to check the status of the transaction. If your authorization is pending, you can try to capture it.

 
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