curl --request GET \
  --url https://api.paycashless.com/v1/invoices/{id} \
  --header 'Request-Signature: <request-signature>' \
  --header 'Request-Timestamp: <request-timestamp>'

{
  "id": "<string>",
  "status": "draft",
  "description": "<string>",
  "currency": "NGN",
  "maxInstallments": 123,
  "number": "<string>",
  "reference": "<string>",
  "acceptPartialPayments": true,
  "amountDue": 123,
  "amountPaid": 123,
  "amountOverpaid": 123,
  "amountRemaining": 123,
  "subTotal": 123,
  "customerId": "<string>",
  "sendEmail": true,
  "totalInclusiveTaxAmount": 123,
  "totalExclusiveTaxAmount": 123,
  "cancellationReason": "<string>",
  "logo": "<string>",
  "invoicePdf": "<string>",
  "receiptPdf": "<string>",
  "callbackUrl": "<string>",
  "returnUrl": "<string>",
  "metadata": {},
  "daysUntilDue": 123,
  "dueDate": "2023-11-07T05:31:56Z",
  "paidAt": "2023-11-07T05:31:56Z",
  "cancelledAt": "2023-11-07T05:31:56Z",
  "liveMode": true,
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "items": [
    {
      "id": "<string>",
      "name": "<string>",
      "quantity": 123,
      "price": 1000,
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "taxRates": [
    {
      "id": "<string>",
      "name": "<string>",
      "percentage": 123
    }
  ]
}