curl --request GET \
  --url https://core.quidkey.com/api/v1/payment-links/{id} \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "merchant": {
      "id": "m1234567-abcd-ef01-2345-678901234567",
      "brand_name": "Acme Corp"
    },
    "amount": "50.00",
    "currency": "EUR",
    "payment_reference": "INV-2024-001",
    "order_id": null,
    "status": "used",
    "link_type": "single_use",
    "views_count": 3,
    "first_viewed_at": "2024-04-01T14:30:00.000Z",
    "expires_at": "2024-04-07T12:00:00.000Z",
    "created_at": "2024-03-31T12:00:00.000Z",
    "transaction_id": "t9876543-dcba-fe01-2345-678901234567",
    "locale": "en",
    "metadata": null,
    "payment_link_url": "https://core.quidkey.com/payment-link/a1b2c3d4e5f6..."
  }
}