curl --request GET \
  --url https://integration.getmateo.com/api/v1/deal_custom_field \
  --header 'Authorization: Bearer <token>'

[
  {
    "deal_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "custom_field_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "created_at": "now()",
    "updated_at": "now()",
    "organisation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "key": "<string>",
    "value": "<string>",
    "date_value": "2023-12-25",
    "string_value": "<string>",
    "number_value": 123,
    "boolean_value": true,
    "datetime_value": "<string>",
    "string_list_value": [
      "<string>"
    ]
  }
]