API ReferenceCore APIService OrderIndicates whether the service order has at least one non-voided invoice (type FT/FR/FS).Indicates whether the service order has at least one non-voided invoice (type FT/FR/FS). GET /gateway/service-order/:guid/has-invoice Indicates whether the service order has at least one non-voided invoice (type FT/FR/FS). Request Responses200401404500SuccessUnauthorizedNot FoundServer Error