This is kind of over my head, I am successfully created the serverside validation for the subscription but I don’t know where to put it ( From logic perspective ) on my Flutter app.

This is kind of over my head, I am successfully created the serverside validation for the subscription but I don’t know where to put it ( From logic perspective ) on my Flutter app.

I want to make a subscription with Flutter in app purchase, but I get this error. I searched for the Invalid sku type error on the internet, but I never encountered it. Does anyone know what causes this error?