curl --request GET \
  --url https://api.chift.eu/consumers/{consumer_id}/invoicing/contacts \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "<string>",
      "source_ref": {
        "id": "<string>",
        "model": "<string>"
      },
      "is_prospect": true,
      "is_customer": true,
      "is_supplier": true,
      "is_company": true,
      "company_name": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "email": "<string>",
      "phone": "<string>",
      "mobile": "<string>",
      "company_id": "<string>",
      "vat": "<string>",
      "company_number": "<string>",
      "currency": "<string>",
      "language": "<string>",
      "comment": "<string>",
      "customer_account_number": "<string>",
      "supplier_account_number": "<string>",
      "birthdate": "2023-12-25",
      "gender": "H",
      "addresses": [
        {
          "address_type": "main",
          "name": "<string>",
          "number": "<string>",
          "box": "<string>",
          "phone": "<string>",
          "mobile": "<string>",
          "email": "<string>",
          "street": "<string>",
          "city": "<string>",
          "postal_code": "<string>",
          "country": "<string>"
        }
      ],
      "external_reference": "<string>"
    }
  ],
  "total": 1,
  "page": 2,
  "size": 2
}