> ## Documentation Index
> Fetch the complete documentation index at: https://developer.hellgate.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Transaction Event

> Triggers an integration service to process a transaction node in a flow.

Sent by Commerce when a flow execution reaches a transaction node. The `ce-type` is set to the value of `startEventType` configured on that node — this is how your integration service identifies which operation to perform.

See [Flow Configuration](/products/commerce/v1/integration/processors/flow-configuration) for transaction node configuration.

`ce-type: <startEventType>`

## Payload

<ParamField body="configuration" type="string">
  Configuration key from the transaction node. Used by the integration service to select the appropriate processing configuration.
</ParamField>

<ParamField body="data" type="object">
  Transaction data passed to the integration service.
</ParamField>

<ParamField body="context" type="object">
  Execution context of the flow at the time the transaction node was reached.
</ParamField>