curl --request PUT \
  --url https://api.example.com/api/Placements/{placementId}/Contacts \
  --header 'Content-Type: application/json' \
  --data '
{
  "contact": 123,
  "hiringMgr": 123,
  "billing1": 123,
  "billing2": 123,
  "billing3": 123,
  "signatory": 123
}
'