curl --request POST \
--url https://api.example.com/api/ChangeRequests/{placementId}/StartDate \
--header 'Content-Type: application/json' \
--data '
{
"rateId": 123,
"startDate": "2023-11-07T05:31:56Z",
"endDate": "2023-11-07T05:31:56Z",
"notes": "<string>"
}
'