database - IPN Paypal - Is it unique? -


i have question, paypal ipn txn_id unique each transaction? mean is, possible have 2 separate transactions, same txn_id? because i'm using txn_id has order id in database, , wanted know if there risk of having duplicated txn id's on 2 different purchases. thanks.

within each environment -- sandbox , live -- transaction ids unique. there crossover same transaction id exists on both sandbox , live, represent different transactions. additionally, in 99.999999% of cases, if have live transaction id, corresponding sandbox transaction id belong else (and vice versa).

ergo, careful don't store both live , sandbox transaction ids in same table , should fine.


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