I wanted to know if there was a way to check if a user has canceled their PayPal subscription and notify my server. I am unable to use webhooks because the webhook is sent on port 443 and Nginx is using that port on my server. I am currently using Paypal smart subscribe buttons and I'm able to detect when a user has subscribed and I can activate their product. I prefer to use Java to handle any requests but I can also use Javascript if needed.
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