I have set up playfab and unity IAP to purchase item and validate using RedeemGooglePlayInventoryItems.
the marketplace integration and marketplace redemption is followed and google add on is set up with the json key from google cloud.
after receiving the purchase receipt I am using that to call the RedeemGooglePlayInventoryItems api by referring to this documentation https://learn.microsoft.com/en-us/gaming/playfab/features/economy-v2/tutorials/getting-started-with-unity-and-android?tabs=create-currency-gm%2Ccreate-items-gm#:~:text=public%20PurchaseProcessingResult%20ProcessPurchase,return%20PurchaseProcessingResult.Complete%3B%0A%20%20%20%20%7D
I am testing this by uploading the build to play store as internal testing and after purchase I get
{"code":500,"status":"InternalServerError","error":"InternalServerError","errorCode":1110,"errorMessage":"Internal server error"}
any solutions?