I am completely new to IdentityServer4 and I cannot figure out how does it create an access token from userid (username?) and secret (password?). Here are some sub questions which makes me confused:
a) Is there a seperate database running for IdentityServer, or I should use whatever DB is used for registration (in case of a single API (other) handling registration)?
b) If there is a seperate database, how does it sync with DB for identity server?
c) Does a registration API need to have some changes too, to work with IdentityServer? Or is it possible to just register it as a service?