Looks up, live from the supplier, the job accounts you can order against at one or more branches, so you can choose preferred_job_account_number before saving a branch with Create Supplier Branch. Pass branch_code (comma-separated for several branches) or, for SRS only, both ship_to_latitude and ship_to_longitude to find your SRS branches near a ship-to location; when SRS receives both coordinates they take precedence over branch_code. For SRS a job account is an SRS job account under your customer code, for ABC Supply it is a Ship-To account, and for QXO it is a job under the QXO account that owns the branch (each QXO entry also returns that account_id). ABC Supply and QXO ignore coordinates, so a coordinates-only request returns an empty list for them. The provider must exist and be CONNECTED; otherwise the request fails with 404 (unknown provider) or 403 (not connected or reconnect required).