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I've just come across these two on Stack Overflow.

is described in its wiki as:

Paypal Instant Payment Notification (IPN) is PayPal's message service that sends a notification when a transaction is affected...

and as:

Instant Payment Notification (IPN) is PayPal's message service that sends a notification when a transaction is affected.

These tags should probably be merged and synonymised under .

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closed as off-topic by Shadow Wizard, ChrisF, Martijn Pieters, CRABOLO, mmyers Sep 4 '14 at 16:42

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question pertains only to a specific site in the Stack Exchange Network. Questions on Meta Stack Exchange should pertain to our network or software that drives it as a whole, within the guidelines defined in the help center. You should ask this question on the meta site where your concern originated." – Shadow Wizard, ChrisF, Martijn Pieters, CRABOLO, mmyers
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How different is paypal-ipn from paypal? Do we really need a separate paypal-ipn tag? (Just curious.) – animuson Jan 1 '13 at 22:01
That's a whole other question @animuson... I have no idea but I'm not going to go down the "do we need the django-* tags" route. There are over 700 questions between the two tags so I think it's fair enough to keep them. Unless, of course, someone with some knowledge of the subject (I have none just noticed dodgy tags) wants to say otherwise. – ben is uǝq backwards Jan 1 '13 at 22:05
@animuson, there are other ways to interact with Paypal than their IPN mechanism, including a few different shopping cart APIs. I'd actually argue that paypal isn't specific enough to ever be a reasonable tag on a question. – Charles Jan 2 '13 at 6:43

I think you're right about using . You never know when you'll end up needing a three-letter acronym for something else; better not to use it now. Also, it's good to have the most common thing on the front of tag; for example, to be able to set favorites to paypal*.

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Wait, youcandowhatnow?? *goes try it* Wow, how come I've never heard of that feature before? You deserve a +1 just for that alone! – Ilmari Karonen Jan 1 '13 at 22:43
Thanks, it's a pretty convenient feature. – Lance Roberts Jan 1 '13 at 22:44

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