Paypal 개발자센터
https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/library_documentation
Payment _status 종류
https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_APPaymentDetails
CREATED – The payment request was received; funds will be transferred once the payment is approved
COMPLETED – The payment was successful
INCOMPLETE – Some transfers succeeded and some failed for a parallel payment or, for a delayed chained payment, secondary receivers have not been paid
ERROR – The payment failed and all attempted transfers failed or all completed transfers were successfully reversed
REVERSALERROR – One or more transfers failed when attempting to reverse a payment
PROCESSING – The payment is in progress
PENDING – The payment is awaiting processing