curl https://thepostalcompany.com/api/v1/letters/a1b2c3d4-e5f6-7890-abcd-ef1234567890 \
  -H "Authorization: Bearer tpc_your_api_key"

const response = await fetch(
  "https://thepostalcompany.com/api/v1/letters/a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  {
    headers: { "Authorization": "Bearer tpc_your_api_key" },
  }
);

const letter = await response.json();
console.log(letter.status);

{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "status": "sent",
  "recipient": "Jane Doe",
  "address": {
    "street": "Keizersgracht",
    "number": "123",
    "suffix": "",
    "postalcode": "1015 CJ",
    "city": "Amsterdam",
    "country": "NL",
    "fullAddress": "Keizersgracht 123, 1015 CJ Amsterdam, NL"
  },
  "content": "Dear Jane,\n\nThis is a letter sent via the API.\n\nBest regards",
  "created_at": "2026-04-14T10:00:00.000Z",
  "updated_at": "2026-04-14T10:00:05.000Z"
}

{
  "error": "Letter not found"
}