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curl -X POST https://rewards-api.getkard.com/v2/issuers/organization-123/fraud \
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     -H "Authorization: Bearer <token>" \
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     -H "Content-Type: application/json" \
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     -d '{
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  "data": [
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    {
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      "id": "myTxnId12345",
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      "type": "fraudulentTransaction",
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      "attributes": {
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        "userId": "userId123"
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      }
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    }
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  ]
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}'

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{
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  "data": [
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    {
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      "id": "myTxnId123",
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      "type": "fraudulentTransaction",
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      "attributes": {
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        "userId": "user123"
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      }
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    }
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  ]
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}