Since Unity IAP is not available for a Unity WebGL Game, What is the best method/solution to process item purchases within a Unity Web game?
Not using Unity IAP.
In our asset Simple IAP System we did an implementation for PlayFab and PayPal for that reason. You might want to look into that - at the very least, you will need some player login system and inventory storage in the cloud in addition to the billing system, so players can access their items from a different device as well.
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