question

>> Hello i want to know if its possible to know who redeem the coupon code? if a player redeemed already that code he will get a message "u already redeemed this code" and if he didnt but someone else already redeem it they the player will get "someone else already redeemed that code".

RedeemCoupon API won’t divide the above two situations. If the coupon has been redeemed already, this API would only return the error “Coupon already redeemed.” If you want to record that who redeemed the coupon, you need to implement your own data warehouse. In PlayFab, the player's redemption record of the coupon will be recorded to the PlayStream Events. Every time when a player redeems the coupon, the event "player_redeemed_coupon" would be generated. You can use Webhooks to pass the event Json to your custom endpoint. Then you can retrieve the players who redeemed the coupon by querying the data you collected.

>> Also another question can i make a player to unclaim that redeem code to let other players redeem it?

PlayFab doesn’t provide such features to revoke the coupon. One coupon only can be redeemed one-time and can’t be revoked. If you want to implement such features, the workaround is to revoke the player A’s corresponding item, then generate a new coupon for the player B. You can write such custom functions on CloudScript.