I couple of weeks before I did an integration of Express Checkout into a rails application. At that moment everything worked really fine until 2 days ago when I had to do some modifications to the payment method and after that I couldn't make it work. After some tests I realised that the notify_url wasn't being calling, I reverted everything to check if it was working and it wasn't. I checked if it was a problem of my app using the IPN simulator but everything went really good so I guess it's a paypal problem maybe? If anyone had the same issue and know how to solve it I would appreciate the help.
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