problem paypal

[joel712]

Hello,

I pay with paypal and after payment this message appeared:

A problem occured, the transaction Could not be completed!
This May Have Happened due to a temporary connection problem.
Severity: Error
Error Code: 10415
Reason: Transaction Refused Because of an invalid argument. See additional error messages for details.
Additional: A successful transaction HAS already-been completed for this token.
Return to the forum.

What must I do?

[JohnnyWalker]

It looks like you are already a customer. Re-check please if you got the access.