I'd like to implement an ironSource Offerwall in my app. I manage user's coins with a Firestore document for each user. ironSource documentation says:
check that we haven't processed the same event before
In short, they'll continue to send callback until my server send a 200 code response to their. But how could I implement a function that check for the eventID and check if the event has already been processed? (even though this shouldn't happeb because of the 200 code response, but they suggest to do also this check).
