C                                RS                   AS
   | [---- Resource Request ------>]|                     |
   |                                |                     |
   | [<-AS Request Creation Hints-] |                     |
   |                                |                     |
   | ------- Token Request  ----------------------------> |
   |                                |                     |
   | <---------------------------- Access Token --------- |
   |                               + Access Information   |