curl -X GET 'https://app.memorylake.ai/openapi/memorylake/admin/v1/billing/invoices/2501a637ff332794f7dc5edee0556e67' \
  -H 'Authorization: Bearer sk_xxxxxx'

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "created_at": 1760000000,
    "hosted_invoice_url": "https://example.com/hosted_invoice",
    "invoice_id": "fc9ec77f14773109fc1b0f8a2749731e",
    "invoice_pdf_url": "https://example.com/invoice_pdf",
    "number": "example",
    "order_id": "98fae70aa1ad919811f9214706e755e1",
    "status": "draft",
    "subtotal": {
      "amount": 1999,
      "currency": "usd"
    },
    "tax": {
      "amount": 1999,
      "currency": "usd"
    },
    "total": {
      "amount": 1999,
      "currency": "usd"
    },
    "due_at": 1760000000
  }
}