I have a customer who relies on IPN to handle some back-end transactions in a system I support, but it seems IPN messages are not being sent to her account. (They are to another customer I support on the same system.) I was going to advise her to check whether IPN is turned on or not, but I can't find the settings anywhere. Some old instructions here https://developer.paypal.com/docs/classic/products/instant-payment-notification/ reference things that no longer exist.
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