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Cannot receive data from third-party webhook due to HTTPS - anybody know why? - 8 years ago

Hey all, I have a PHP web application running Nginx on an Amazon EC2 instance. We are trying to integrate a payment system (Payoneer). We are using HTTPS. Due to this, Payoneer is not able to send any data to our URL. There is a 403 error. Any reason why? Weird thing is - we're really not sure why our server is refusing the webhook connections. The only thing we DO know is that it works f