Reconciliation

This guide explains how to reconcile transactions between your internal systems and the Grid API using two complementary mechanisms: real-time webhooks and periodic queries.

Use webhooks for real-time updates and daily queries as a backstop to detect missed events or data drift.

Handling webhooks

Listen for transaction webhooks to track transaction status change until a terminal state is reached.

Expected terminal statuses for outgoing transactions: COMPLETED, FAILED, EXPIRED. However, transitions between these can occur (e.g., a bank return moves COMPLETED → FAILED). Also listen for OUTGOING_PAYMENT.REFUND_COMPLETED and OUTGOING_PAYMENT.REFUND_FAILED to track refunds on failed transactions.

Outbound transactions: The originating account is debited at transaction creation. If the transaction ultimately fails, a refund is posted back to the originating account.
Inbound transactions: The receiving account is credited only on success. Failures do not change balances.

Grid retries failed webhooks up to 160 times over 7 days with exponential backoff. Use the dashboard to review and remediate webhook delivery issues.

Subscribe and verify signatures

Configure your webhook endpoint and verify signatures. See Webhooks.Sample webhook payload:

{
  "id": "Webhook:019542f5-b3e7-1d02-0000-0000000000ab",
  "type": "OUTGOING_PAYMENT.COMPLETED",
  "timestamp": "2025-10-03T15:30:01Z",
  "data": {
    "id": "Transaction:019542f5-b3e7-1d02-0000-000000000030",
    "status": "COMPLETED",
    "type": "OUTGOING",
    "source": {
      "sourceType": "ACCOUNT",
      "accountId": "InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965"
    },
    "destination": {
      "destinationType": "ACCOUNT",
      "accountId": "ExternalAccount:a12dcbd6-dced-4ec4-b756-3c3a9ea3d123"
    },
    "sentAmount": {
      "amount": 10000,
      "currency": { "code": "USD", "symbol": "$", "decimals": 2 }
    },
    "receivedAmount": {
      "amount": 9200,
      "currency": { "code": "EUR", "symbol": "€", "decimals": 2 }
    },
    "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
    "platformCustomerId": "customer_12345",
    "createdAt": "2025-10-03T15:00:00Z",
    "settledAt": "2025-10-03T15:30:00Z",
    "description": "Payment for services - Invoice #1234"
  }
}

When the transaction’s source or destination is an external crypto wallet, that source / destination object also includes an onChainTransaction (transactionHash + network, e.g. SOLANA) once the crypto transfer settles — use it to match the transfer on a block explorer. The hash can land shortly after the terminal status, so a terminal webhook payload may not include it yet; retrieve the transaction (GET /transactions/{id}) to read it once settled.

Process events idempotently

Use the envelope id, data.id, and timestamp to ensure idempotent handling, updating your internal ledger on each status transition.

Recognize terminal states

When a transaction reaches a terminal state, finalize your reconciliation for that transaction.

Reconcile via queries

Additionally, you can list transactions for a time window and compare with your internal records.

We recommend querying days from 00:00:00.000 to 23:59:59.999 in your preferred timezone.

cURL

curl -X GET 'https://api.lightspark.com/grid/2025-10-13/transactions?startDate=2025-10-01T00:00:00.000Z&endDate=2025-10-01T23:59:59.999Z&limit=100' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'

Response

{
  "data": [
    {
      "id": "Transaction:019542f5-b3e7-1d02-0000-000000000030",
      "status": "COMPLETED",
      "type": "OUTGOING",
      "source": {
        "sourceType": "ACCOUNT",
        "accountId": "InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965"
      },
      "destination": {
        "destinationType": "ACCOUNT",
        "accountId": "ExternalAccount:a12dcbd6-dced-4ec4-b756-3c3a9ea3d123"
      },
      "sentAmount": {
        "amount": 10000,
        "currency": { "code": "USD", "symbol": "$", "decimals": 2 }
      },
      "receivedAmount": {
        "amount": 9200,
        "currency": { "code": "EUR", "symbol": "€", "decimals": 2 }
      },
      "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
      "platformCustomerId": "customer_12345",
      "description": "Payment for services - Invoice #1234",
      "exchangeRate": 0.92,
      "settledAt": "2025-10-03T15:30:00Z",
      "createdAt": "2025-10-03T15:00:00Z"
    }
  ],
  "hasMore": true,
  "nextCursor": "eyJpZCI6IlRyYW5zYWN0aW9uOjAxOTU0MmY1LWIzZTctMWQwMi0wMDAwLTAwMDAwMDAwMDAzMCJ9",
  "totalCount": 45
}

Troubleshooting

Missing webhook: Check delivery logs in the dashboard and ensure your endpoint returns 2xx. Retries continue for 7 days.
Mismatched balances: Re-query the date range and verify terminal statuses; remember outbound failures are refunded, inbound failures do not change balances.
Pagination gaps: Always follow nextCursor until hasMore is false.

Overview

Onboarding

Managing accounts

Sending payments

Global Accounts

Platform tools

Handling webhooks

Reconcile via queries

Troubleshooting

​Handling webhooks

​Reconcile via queries

​Troubleshooting

Handling webhooks

Reconcile via queries

Troubleshooting