What could be the reason for the "Steam API rejected request as unauthorized due to invalid title Application ID or Publisher Key" ?

What could be causing the "Steam API rejected request as unauthorized due to invalid title Application ID or Publisher Key" error when using the PlayFabClientAPI.PayForPurchase() method? This issue has been occurring since 16/05/2023, and I have verified that the Steam Application ID and Steam Web API Key are correct. Additionally, I have updated the Steam SDK to version 1.57 and I'm currently using the GetAuthTicketForWebApi method for authentication. Strangely, I can successfully authenticate with LoginWithSteam(), but the error persists when attempting to make a purchase.

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Neils Shi commented · May 25, 2023 at 07:03 AM

Since you can successfully authenticate with LoginWithSteam(), it looks like you have set up Steam Application ID and Steam Web API Key correctly. You mentioned that "this issue has been occurring since 16/05/2023", can PayForPurchase be used successfully before that?

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