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I've been using PayPal for the last few years with the same scripts on our CMS for an online game.
When people were donating via PayPal for credits they were receiving them automatically on their account after PayPal was sending the confirmation back.
Without any modifications on the web/cms and starting from ~18hours ago the same things that worked for several years stopped working (the donation is received but credits aren't given by CMS or transactions logged). It's like the pingback from PayPal isn't working anymore.
So, my question is, was there any changes on PayPal side that could've affected it? If not, anyone have any clue why it stopped working after so long time and without any changes?