Operates on Subcontractors, shown in the Zuper client app as "Subcontractor" (in every industry). Subcontractors share the exact same underlying schema and endpoints as Vendors / Suppliers; they're distinguished only by the vendor_type field (SUB_CONTRACTOR here) and the /subcontractors route prefix. vendor_type is always enforced server-side based on this route; you cannot use this endpoint to read the other module's records.