PayPal Adaptive Payments: ExecutePayment returns payKey AP-XXXX has already been used to make a payment

Question

I first call the Pay API with actionType=CREATE and only after user has been redirected to my returnUrl i'm calling the ExecutePayment API with the pay_key received at first Pay call.

PP returns this error message: payKey AP-XXXX has already been used to make a payment

Does anyone know what could trigger this error and how to solve it?

Thanks

Answer 1

You are doing an explicit payment (redirecting the user to the PaPal website) and therefore the confirmation of the user leads to the execution of the payment. Take a look here: https://stackoverflow.com/a/29473433/1536921