Create a Datadog Synthetic multistep API test to validate an authenticated API flow

Steps

1. POST to the Datadog Synthetics API endpoint for creating API tests, setting the type field to 'api' and the subtype to 'multi' to create a multistep test; include locations, message, name, options, and status fields in the request body.
2. Define the steps array in the config object; each step object contains name, subtype (e.g., 'http'), request (method, url, headers, body), and assertions arrays that define pass/fail criteria for that step.
3. Use extractors in each step's extract array to capture response values (e.g., a bearer token from step 1's JSON response) into variables; reference these variables in subsequent step request fields using the {{ VARIABLE_NAME }} syntax.
4. Set assertions per step using the operator field (e.g., 'is', 'contains', 'lessThan') against targets such as statusCode, body, header, or responseTime to gate progression through the chain.
5. Configure the options object with tick_every (polling interval in seconds), min_failure_duration, min_location_failed, and retry settings; set monitor_options.renotify_interval if escalation alerts are needed.
6. Activate the test by setting status to 'live' in the creation payload or via a subsequent PUT request; retrieve results from the Synthetics results endpoint using the test's public_id.