Add contact to a market maker

{
  "data": {
    "archived": false,
    "contacts": [
      {
        "email": "test@user.com",
        "id": "7da8e726-a1bc-11ee-80cf-560f156a658b",
        "name": "Test User",
        "type": "user"
      }
    ],
    "email": "anon@nymous.com",
    "entity": {
      "id": "6ebe0a0f-bb8f-49be-80ea-c6b72c348fea",
      "type": "business"
    },
    "id": "7da75a46-a1bc-11ee-9a32-560f156a658b",
    "name": "Anon Nymous",
    "swap_provider": false,
    "swap_weight": 0
  }
}