post https://us-central1-readysandbox.cloudfunctions.net/gamePass-addQuantityForUser
The quantity can be negative to deduct game passes.
The minimum quantity is of user owned game passes is 0.
If you want to remove the game pass for a user, use the deleteFromUser endpoint.
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Responses
400Invalid argument error for invalid input values.
410Not Found error indicating the game pass or user does not exist.