Find or create a thread for the given phone number and project, then initiate a phone call.
API key for your Puppeteer organization.
The phone number to call, in E.164 format (e.g., +12025550123).
The UUID of the Puppeteer project.
Timezone for the thread (e.g., "America/Chicago").
JSON data as a string to be sent to the thread upon creation. This data will be processed by the thread's JSON input handler.
ISO 8601 datetime to schedule the call for a future time. If omitted, the call starts immediately.
When true, the call is queued and the endpoint returns 202 immediately. When false (default), the call is initiated synchronously.