See the billing address on file. Use this to show or confirm it. Returns the address, or null when none is saved. When the user's company is billed to its partner or its account, the address returned is the company owner's.

Prerequisites: a bearer token, and the user's id (user_id) from List users.

Authentication: Partner or Account token. user_id must be a user inside your own account tree; otherwise 422.

Rate limit: none.