curl --request POST \
  --url https://api.feedspace.io/v3/oauth/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data 'grant_type=<string>' \
  --data 'client_id=<string>' \
  --data 'client_secret=<string>' \
  --data 'username=<string>' \
  --data 'password=<string>' \
  --data 'refresh_token=<string>'

{
  "token_type": "Bearer",
  "expires_in": 31536000,
  "access_token": "<access_token>",
  "refresh_token": "<refresh_token>"
}