You can get a token by making a request for the token (as per example below).
But how do you get a (client credential) access token from within identityserver class (without requesting it via http POST web service api)? is there an identityserver4 method to use to obtain an access token?
http://docs.identityserver.io/en/release/endpoints/token.html
POST /connect/token
client_id=client1&
client_secret=secret&
grant_type=authorization_code&
code=hdh922&
redirect_uri=https://myapp.com/callback
Yes you can use the IssueJwtAsync
or IssueClientJwtAsync
methods from the IdentityServerTools
class to do exactly that.
As per documentation.