curl --request GET \
  --url https://openapi.pluuug.com/v1/contract \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Signature: <api-key>'

{
  "results": [
    {
      "id": 123,
      "title": "<string>",
      "amount": 1,
      "created": "2023-11-07T05:31:56Z",
      "contractNumber": "<string>",
      "startDate": "2023-12-25",
      "endDate": "2023-12-25",
      "inquiry": {
        "id": 123,
        "uniqueId": "<string>",
        "status": {
          "id": 123,
          "title": "<string>",
          "folder": {
            "id": 123,
            "name": "<string>"
          }
        },
        "name": "<string>",
        "estimate": "<string>",
        "inquiryDate": "2023-12-25"
      },
      "client": {
        "id": 123,
        "status": {
          "id": 123,
          "title": "<string>"
        },
        "companyName": "<string>",
        "inCharge": "<string>",
        "position": "<string>",
        "contact": "<string>",
        "email": "jsmith@example.com"
      },
      "categorySet": [
        {
          "id": 123,
          "title": "<string>"
        }
      ]
    }
  ],
  "next": "http://api.example.org/accounts/?cursor=cD00ODY%3D\"",
  "previous": "http://api.example.org/accounts/?cursor=cj0xJnA9NDg3"
}