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

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "items": [
      {
        "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
      }
    ],
    "continuation_token": "eyJvZmZzZXQiOjIwfQ",
    "total": 1
  }
}