Looking for a way to link a Blynk user account to a third party service

I was thinking of making a web app that lets users add in their Blynk auth token and by using Blynk API and amazon echo’s API. This web app can automatically link the widgets to amazon echo and google assistant. but there’s an obvious problem here. I feel it’s a bad idea for users to be sharing their Blynk Auth token(s) to a 3rd party service. I was wondering if there is a way around that by using OAuth of some kind. feel free to list any suggestions you have otherwise.
PS: I do plan to code this on Python using flask since that’s the only framework I am familiar with. but the project will be opensource and free as long as I am able to host it for free preferably using Heroku.

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