curl --request POST \
  --url https://api.example.com/{version}/counterparties/create \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "relationship_type": "<string>",
  "party_id": 123
}
'

{
  "id": 123,
  "owner_party_type": "<string>",
  "owner_party_id": 123,
  "relationship_type": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}