curl --request GET \
  --url https://api.smokeball.com/contacts/{contactId}/relations \
  --header 'Authorization: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "<string>",
  "href": "<string>",
  "relation": "<string>",
  "method": "GET",
  "self": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "value": [
    {
      "id": "<string>",
      "href": "<string>",
      "relation": "<string>",
      "method": "GET"
    }
  ],
  "offset": 123,
  "limit": 123,
  "size": 123,
  "first": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "previous": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "next": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "last": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  }
}