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The documentation mentions using FBInstant.player.getSignedPlayerInfoAsync() to get a signature when communicating with a custom backend.

https://developers.facebook.com/docs/games/instant-games/guides/bots-and-server-communication

Can I store the signature in a variable at the start of the app and then just use it throughout all the XMLHttpRequests for the current session?

Or do I need to call it everytime I make an XMLHttpRequest?

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  • Once you look at what parameter that method gets passed, that question should kinda answer itself, no? Commented Jun 21, 2018 at 6:45

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You are free to only call it once, however this will not allow you to validate the issued_at time, or to encrypt custom payloads.

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