Authenticate to a RESO Web API MLS server using the OAuth2 client credentials grant
domain: transport.reso.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Obtain a client_id and client_secret from the MLS or data provider implementing the RESO Web API
POST to the provider's token endpoint with grant_type=client_credentials, client_id, and client_secret as an application/x-www-form-urlencoded body
Extract the returned access_token and its expires_in value from the JSON response
Attach the access_token as an Authorization Bearer header on subsequent RESO Web API OData requests
Refresh the token before it expires rather than waiting for a 401, since client credentials tokens are typically short-lived
Known gotchas
The RESO Web API Core spec allows providers to implement OAuth2 Bearer or Client Credentials, so exact token endpoint paths and supported grants vary by MLS vendor and must be confirmed per provider
Client credentials are meant for server-side confidential clients only; embedding them in a client-side app exposes the secret
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