I have API in my site, and need to use access token for every request from client application. I don't have a user for authentification. I have client id in db of my site and client app will have that client id too. What stages I need to do using OAuth 2.0 from phpleague? Do I need to use just 'refresh token grant'?
What i can understand from your question .Yes, Access tokens reside for a fix time,probably for an hour but after that you need to use a refresh token and that will do the work.