Refresh Token missing

When I request my "access token", by passing my "auth token", I was expecting to also receive a "refresh token", however it's missing.

Can someone explain why it's missing, and how I get hold of a refresh token?

This is what's returned...
```
access_token:
"eyJhbGciOiJSUzI1NiIsIyJqdGkiWIiOjEsImV4cCI6OiIwMWZkNWVkMi1mNzI0LTRhNzMtODUyNC01OWJhMnCYNXZX89ViZkuiMWEDZiZjRlNTgiLCJzdMTUyMDAxMTA2NiwiaWF0IjoxNTIwMDA3NDY2fQ.2Yk9qz5smUWqNMlSwCvPXjHZzknun9wcP62fytVR1lof4tEjnR5cCI6IkpXVCJ9.euYYKeEP_zb_A1dDYLpKhnBLFoW5Ama9pOrJkz77fJ_gVnemdR9LrrKof9xIAF9JemuYMroCjIawDWHIbiv9tmu4lAO-DIsA6EQN1ER_6SPGofS-Ze07zDEFzQgBLrE5s3v-EGaz6CBczHPyCuFchZ7xnoZ_J3YnuP00PyDYwY5vv9xgPIsz_k0V9Hz3VVlcZu-2YjGxiLrRFgx2lhZP5jlKEI_Qs0_xMtyOE6972ck72CFEnqIxpiPUFRlN9s8f7jRBAnLkkFYh_e4H8FNeA"
expires_in:3600
token_type:"Bearer"
```

The issue identifies an OAuth 2.0 token response but names no files, tests, or entry points. Start by locating the authorization and token-response documentation or implementation, then determine where refresh-token behavior is specified; done means the supported behavior and steps for obtaining a refresh token are documented.

Written by the indexing model from the issue text.