curl https://thepostalcompany.com/api/v1/letters \
  -H "Authorization: Bearer tpc_your_api_key"

const response = await fetch("https://thepostalcompany.com/api/v1/letters", {
  headers: { "Authorization": "Bearer tpc_your_api_key" },
});

const { letters } = await response.json();
console.log(`You have ${letters.length} letters`);

{
  "letters": [
    {
      "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
      "status": "sent",
      "recipient": "Jane Doe",
      "address": {
        "street": "Keizersgracht",
        "number": "123",
        "postalcode": "1015 CJ",
        "city": "Amsterdam",
        "country": "NL"
      },
      "content": "Dear Jane,\n\nHello!\n\nBest regards",
      "created_at": "2026-04-14T10:00:00.000Z",
      "updated_at": "2026-04-14T10:00:05.000Z"
    }
  ]
}