curl --request POST \
  --url https://api.slash.com/expense-report/{expenseReportId}/reject \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "reviewedByUserId": "<string>",
  "reason": "<string>"
}
'

{
  "expenseReport": {
    "id": "<string>",
    "legalEntityId": "<string>",
    "submittedByUserId": "<string>",
    "amountCents": 123,
    "currency": "<string>",
    "transactionDate": "2023-11-07T05:31:56Z",
    "destinationId": "<string>",
    "submittedAt": "2023-11-07T05:31:56Z",
    "status": "pending_review",
    "timestamp": "2023-11-07T05:31:56Z",
    "merchant": {
      "type": "merchantV2",
      "merchantV2": {
        "$entity": "merchant_v2",
        "id": "<string>",
        "name": "<string>",
        "isLive": true,
        "isInstantCashback": true,
        "metadata": {
          "timestamp": "2023-11-07T05:31:56Z"
        },
        "heronId": "<string>",
        "iconUrl": "<string>",
        "logoUrl": "<string>",
        "url": "<string>",
        "merchantCategoryId": "<string>"
      }
    },
    "merchantV2Id": "<string>",
    "customMerchantId": "<string>",
    "memo": "<string>",
    "fxRateToUsd": "<string>",
    "fxRateUpdatedAt": "2023-11-07T05:31:56Z",
    "noReceiptReason": "<string>",
    "documents": [
      {
        "document": {
          "$entity": "document",
          "id": "<string>",
          "accountType": "legalEntity",
          "accountId": "<string>",
          "startDate": "<string>",
          "endDate": "<string>",
          "status": "uploaded",
          "accessLevel": "<string>",
          "documentType": "business_entity",
          "category": "document",
          "timestamp": "<string>",
          "filename": "<string>",
          "error": "<string>",
          "checksum": "<string>",
          "tags": [
            "<string>"
          ],
          "documentSource": "uploaded",
          "fileMetadata": {
            "size": 123,
            "type": "<string>"
          }
        },
        "url": "<string>"
      }
    ],
    "aggregatedTransaction": {
      "id": "<string>",
      "date": "<string>",
      "amount": {
        "amount_cents": 123,
        "currency": "USD"
      },
      "status": "pending"
    },
    "destination": {
      "id": "<string>",
      "accountName": "<string>",
      "institution": {
        "id": "<string>",
        "name": "<string>"
      },
      "mask": "<string>",
      "institutionLogo": "<string>"
    },
    "submittedByUser": {
      "id": "<string>",
      "name": {
        "first": "<string>",
        "last": "<string>",
        "full": "<string>"
      }
    },
    "reviewedByUser": {
      "id": "<string>",
      "name": {
        "first": "<string>",
        "last": "<string>",
        "full": "<string>"
      }
    },
    "review": {
      "id": "<string>",
      "expenseReportId": "<string>",
      "decision": "approved",
      "reviewedByUserId": "<string>",
      "reviewedAt": "2023-11-07T05:31:56Z",
      "timestamp": "2023-11-07T05:31:56Z",
      "rejectionReason": "<string>"
    }
  }
}