Hello,

There is any way to generate Access Token Without Using Username and Password not even login on web form also ? Just Using Client Id ,Client Secret or other rather than including password  Using REST API.

I also tried OAuth Web Server API flow and OAuth User Agent API flow can issue a refresh and access token but the user has to go through an Browser to login and authorize the App. So you agree with me it's not so much user-friendly for a Customer. So, there is any way to remove this login and Authorization part.

It is mandatory to  use Username and Password to get Access or Refresh Token using REST API ?

There is one more question it is possible to  get access token any time using Refresh token ?