curl --request GET \
  --url https://connect.withvayu.com/invoices/{invoiceId} \
  --header 'Authorization: Bearer <token>'

{
  "invoice": {
    "customerId": "<string>",
    "contractId": "<string>",
    "name": "<string>",
    "billingCycle": {
      "startTime": "2023-11-07T05:31:56Z",
      "endTime": "2023-11-07T05:31:56Z"
    },
    "lineItems": [
      {
        "invoiceId": "<string>",
        "revenueBreakdown": {
          "total": 123,
          "subtotal": 123,
          "overage": 123,
          "discount": 123,
          "creditsUsed": 123,
          "tax": 1
        }
      }
    ],
    "amount": 123,
    "id": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
}