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

{
  "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>"
}