PROSHIPPING CORE API swagger documention updates

A new CarrierSpecifics object has been added to the Get Carrier Services endpoint response to include a ServiceLevels field, allowing users to retrieve the service levels associated with each requested service code.

[
  {
    "ServiceCode": "CRL1",
    "Description": "Royal Mail 24 Standard/Signed For (Parcel - Daily Rate Service)",
    "CarrierSpecifics": {
      "ServiceLevels": [
        "01",
        "02"
      ]
    }
  }
]

Response payload example