Connect app (Apps Marketplace) to Azure SQL DB

Hi,

i implemented an app, which i want so sell via marketplace. First of all there is no chance to add a selling price for a Power BI App.

So i am trying to implement a bypass monetarization by connecting from the PowerBi App to a azure sql db, where a token is checked.

No, of course, i cannot add a firewall rule, because i don't know the ip of the customer, who loaded the app from store. Also i want to avoid, that the customer has to type in the credentials for the azure sql database.

Anybody, who solve this.  Is it possible to solve at all?

Thank you very much

Andy