Housecall Pro API Setup Clarification

I use Make.com alongside Housecall Pro and need a clear answer on a single point: can the “This customer bills to” parent/child relationship be created or updated through the Housecall Pro API?

If it is possible, I want the precise settings required—endpoint, payload structure, field names, and any mandatory flags or IDs—so I can configure it myself in Make.com. I do not need help with authentication or the overall integration flow; just the definitive configuration details that make the relationship stick.

Deliverable:
• Written explanation confirming whether the feature is supported.
• If supported, a concise example request (JSON or form-data) and the corresponding expected response, plus any notes on required headers or versioning.

Please reply only if you have first-hand experience or verifiable documentation for this specific capability in Housecall Pro’s API.