curl --request GET \
  --url https://api.zenskar.com/contacts \
  --header 'organisation: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "results": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "customer": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "send_contract": false,
      "send_invoice": true
    }
  ],
  "next": "V2VsbCBhcmV1IGN1cmlvdxM=",
  "previous": "GmBsbCBhcmV1IGN1cmlvdxM=",
  "total_count": 123
}