Reject transaction after receiving IPN

Question

Is it possible to reject / auto refund after receiving IPN message with COMPLETED status but the txn_id is duplicated or the price value is incorrect?

Or manual investigation need to be done to refund

You can call the refund API. Is that what you mean? – geewiz Apr 15 '15 at 16:25 — geewiz, Apr 15 '15 at 16:25

score 0 · Answer 1 · edited May 23 '17 at 12:14

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If you are verifying your IPN calls with PayPal, this should (in theory) be impossible. PayPal never duplicates transaction IDs.

edited May 23 '17 at 12:14

Community

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answered Apr 15 '15 at 23:14

Machavity

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So why does all their sample IPN code have checkes for duplicates? – user207421 Apr 15 '15 at 23:56
Because you can be sent the same IPN more than once if PayPal doesn't get a 200 response – Machavity Apr 15 '15 at 23:58

score 0 · Answer 2 · answered Apr 15 '15 at 23:57

Is it possible to reject / auto refund after receiving IPN message with COMPLETED status but the txn_id is duplicated or the price value is incorrect?

You can't reject the transaction with IPN. You aren't in a transaction. You're getting notification that a transaction has already occurred.

You may be able to use another API to reverse the transaction, as suggested by @geewhiz.

Reject transaction after receiving IPN

2 Answers2