title: How to get Spotify api access token without asking user to login?
body: <p>Coding in PHP, I try to initialize Spotify API, without using redirect uri, just using client_id and client_secret.
  I try the code below : <a href="https://stackoverflow.com/questions/24519788/extract-token-from-response-url-spotify-api">Extract token from response url - Spotify API</a>  but I get a NULL result</p>
  
  <p>I wonder if If I can access token without asking user to login (cf. <a href="https://developer.spotify.com/web-api/authorization-guide/#authorization-code-flow" rel="nofollow noreferrer">https://developer.spotify.com/web-api/authorization-guide/#authorization-code-flow</a>)</p>