Hi.
I want to make the project with authentification via telegram, is it possible?
or if the user wants to use some widget, I will get the request via push or e-mail, if I will allow him, his e-mail will be added to the database.
Or maybe just make some password protection for specified widgets.
Please advice, if it’s possible to arrange all these.
It sounds like you want them to authenticate with you, not Blynk.
If so, you could setup any scheme for keywords/passwords/encrypted tokens they they fetch from you directly via email, forked stick, or in real-time from a server that you run.