curl --request DELETE \
  --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": "random uuid",
  "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>"
  ]
}