curl --request PUT \
  --url https://api.example.com/api/ChangeRequests/Client-Ref/{changeRequestId} \
  --header 'Content-Type: application/json' \
  --data '
{
  "rateId": 123,
  "clientReference": "<string>",
  "effectiveDate": "<string>",
  "notes": "<string>"
}
'