curl -X GET https://api.whaapy.com/contacts/v1/fields \
  -H "Authorization: Bearer wha_TU_API_KEY"

{
  "fields": [
    {
      "id": "field-uuid-1",
      "name": "company",
      "type": "text",
      "description": "Nombre de la empresa",
      "is_required": false,
      "category": "business"
    },
    {
      "id": "field-uuid-2",
      "name": "contract_value",
      "type": "number",
      "description": "Valor del contrato en USD",
      "is_required": false,
      "category": "sales"
    },
    {
      "id": "field-uuid-3",
      "name": "birth_date",
      "type": "date",
      "description": "Fecha de nacimiento",
      "is_required": false,
      "category": "personal"
    },
    {
      "id": "field-uuid-4",
      "name": "website",
      "type": "url",
      "description": "Sitio web del contacto",
      "is_required": false,
      "category": "business"
    }
  ],
  "total_fields": 4
}