How to reward sender when accept facebook invites on iOS and Android -

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my client wants make small game ios , android rewards users when friends accept invites through facebook.

i've read several questions , solutions found on site getting "from" , "to" fields facebook request.

however, on mobile, when new user clicks notification on fb apps, he/she redirected appstore page , need download app first. after downloading, when new user opens , logs in app, how can know sender can reward him?


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