List customers

curl --request GET \
  --url https://api.alguna.io/customers \
  --header 'Alguna-Version: <alguna-version>' \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "created_at": "2026-04-01T10:00:00Z",
      "currency": "USD",
      "id": "cust_abc123",
      "name": "Acme Corp",
      "updated_at": "2026-04-01T12:30:00Z",
      "aliases": [
        "<string>"
      ],
      "billing_address": {
        "city": "San Francisco",
        "country": "USA",
        "line1": "123 Main St",
        "postal_code": "94105",
        "state": "CA",
        "line2": "Suite 100"
      },
      "contacts": [
        {
          "email": "john@example.com",
          "id": "cont_abc123",
          "is_primary": true,
          "email_preferences": [
            "<string>"
          ],
          "first_name": "John",
          "last_name": "Doe"
        }
      ]
    }
  ],
  "pagination": {
    "per_page": 20,
    "total_pages": 5
  }
}