How to check if an FB AppRequest has been clicked on or not? [closed]
As per facebook's documentation you can pass an arbitrary data parameter to be used for tracking purposes. You could pass a unique id that you keep a reference to the from->to relationship in your db to know which invite was invoked.
edit: let me know if you need any more clarification.
As per FB's Graph API there isn't a way to identify which AppRequest were clicked or not. I can get the list of all AppRequests from my app but there isn't a boolean field indicating which one has or hasn't been clicked on.