OAuth

POST /oauth/register
Content-Type: application/json

{
  "client_name": "My Integration",
  "redirect_uris": ["https://myapp.com/callback"],
  "grant_types": ["authorization_code"],
  "token_endpoint_auth_method": "client_secret_post"
}

{
  "client_id": "abc123",
  "client_secret": "secret456",
  "client_name": "My Integration",
  "redirect_uris": ["https://myapp.com/callback"]
}

GET /oauth/authorize?
  client_id=YOUR_CLIENT_ID&
  response_type=code&
  redirect_uri=https://myapp.com/callback&
  scope=api&
  state=random_state_value&
  code_challenge=CHALLENGE&
  code_challenge_method=S256

https://myapp.com/callback?code=AUTH_CODE&state=random_state_value

POST /oauth/token
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code&
code=AUTH_CODE&
redirect_uri=https://myapp.com/callback&
client_id=YOUR_CLIENT_ID&
client_secret=YOUR_CLIENT_SECRET&
code_verifier=YOUR_PKCE_VERIFIER

{
  "access_token": "eyJhbG...",
  "token_type": "Bearer",
  "expires_in": 3600,
  "refresh_token": "dGhpcyBpcyBh..."
}

GET /rest/companies
Authorization: Bearer ACCESS_TOKEN

POST /oauth/token
Content-Type: application/x-www-form-urlencoded

grant_type=refresh_token&
refresh_token=YOUR_REFRESH_TOKEN&
client_id=YOUR_CLIENT_ID&
client_secret=YOUR_CLIENT_SECRET

POST /oauth/token
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials&
client_id=YOUR_CLIENT_ID&
client_secret=YOUR_CLIENT_SECRET&
scope=api

GET /.well-known/oauth-authorization-server