• You can send the events to Event Hub via APIM by referring to How to log events to Azure Event Hubs in Azure API Management doc.
• Enable system managed identity in APIM and then, grant Azure Event Hubs Data sender RBAC role to APIM identity in event hub instance as shown below.

• I have created a logger with the credentials of APIM managed identity using below Rest API and request body.

PUT https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}/loggers/{loggerId}?api-version=2024-06-01-preview

{
  "properties": {
    "loggerType": "azureEventHub",
    "description": "Event Hub logger with system-assigned managed identity",
    "credentials": {
         "endpointAddress":"<EventHubsNamespace>.servicebus.windows.net",
         "identityClientId":"SystemAssigned",
         "name":"<EventHubName>"
    }
  }
}

• Lets say, I am passing the events in request body and would like to send the same events to event hub, then add the below given policy either in operation level or API level.

<policies>
    <inbound>
        <base />
        <log-to-eventhub logger-id="testlogger">
            @(context.Request.Body.As<string>(preserveContent: true))
        </log-to-eventhub>
    </inbound>
</policies>

I am able to send events to event hub successfully via APIM.