# Check Duplicates Before Import

> Solarium docs, Venn / Bank CSV Import. All requests are `POST https://api.trysolarium.com/graphql/` with `Authorization: Bearer <api key>` and a JSON body `{"query": ..., "variables": ...}`. Every query and mutation takes an `organizationId` (find it with `myOrganizations`). Index of all pages: https://trysolarium.com/llms.txt

Run checkBankStatementDups first to detect duplicates. Returns per-row flags so you can skip or override.

### Request

```graphql
mutation {
  checkBankStatementDups(
    organizationId: "a1b2c3d4-..."
    paymentAccountId: "bank-account-uuid"
    rows: [
      {
        transactionDate: "2026-06-19"
        description: "MVC INC."
        amount: "23.55"
        eventType: "expense"
      }
    ]
  ) {
    results {
      rowIndex
      isDuplicate
      isPossibleDuplicate
      matchingEventId
    }
    success
  }
}
```

### Response

```json
{
  "data": {
    "checkBankStatementDups": {
      "results": [
        {
          "rowIndex": 0,
          "isDuplicate": true,
          "isPossibleDuplicate": false,
          "matchingEventId": "e5f6g7h8-..."
        }
      ],
      "success": true
    }
  }
}
```