For example, if your account contains the following carrier services:

ReferenceDescription
DFD_ND_01DFD Next Day Service
UPQ_48UPQ 48 Hour Service
PEG_LLPegasus Light and Large

Any request to allocate with a specific carrier service that is not in this list will result in an error code of carrier_service_not_found.

  PUT /pro/shipments/sp_00980781386890476031324735930383/allocate/service/UPQ_99
  

This request will fail because there is no carrier service with a reference of UPQ_99.