---
title: Send Optimizely Data Platform data with Real-Time Audiences for Feature Experimentation for the Flutter SDK
slug: feature-experimentation/docs/send-odp-data-with-real-time-audiences-for-feature-experimentation-flutter
docTags: 
createdAt: 2026-08-05T20:39:53.000Z
---

## Prerequisites

Before sending events to ODP from Feature Experimentation, you must configure [Real-Time Audiences for Feature Experimentation](docId:6UBBxxRv331nBIVZ2lun8).

## Minimum SDK version

v2.0.0 or higher

## Description

The Optimizely Client extension method `sendOdpEvent` lets you send data to the ODP server. You can then use this data to analyze user behavior and optimize experiences across different channels and touchpoints.

Use the `sendOdpEvent` method to

- [Merge or stitch users together](docId\:zofYSXRfkDa-2L5Umjfmy) and determine which event is associated with which customer.
- Send various types of events and actions, such as pageviews, clicks, form submissions, and others. You can include additional data to provide more context and information about the event being tracked.

For example, by connecting an email address identifier with a `fs_user_id` identifier, you can use the `sendOdpEvent` method to send events that are associated with both identifiers. This lets you track and analyze the behavior of a specific user across different touchpoints and devices.

You cannot create or update user profile data like name or address with `sendOdpEvent`. Instead, you can use the [ODP Create and update customers API endpoint](docId:8V9hWw_Py3-kwJJ5H7uR0) or [ODP UI](docId:9GxAiVHBPBQndq-66qYBy) to manage customer profiles.

## Send events to ODP

The Flutter SDK discards the event immediately if there are any errors (`sdkNotReady`, `odpNotIntegrated`, or `odpNotEnabled`).

## Parameters

`sendOdpEvent` method parameters.

| Parameter               | Type   | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| ----------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| \`type\`                | String | The type of event to be sent, which is "fullstack" for all Flutter SDK-generated events if not specified.                                                                                                                                                                                                                                                                                                                                                                         |
| \`action\` \_required\_ | String | Specifies the subcategory of the event type, which is used to track the app and user lifecycle.                                                                                                                                                                                                                                                                                                                                                                                   |
| \`identifiers\`         | Map\\  | A key-value map of user identifiers.                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| \`data\`                | Map\\  | The event data in a key-value map. The value can be any type (string, number, or Boolean.) Null values are allowed but are interpreted as empty strings. The Flutter SDK adds default event data to the given data dictionary. When creating your Map, you can overwrite the default data values by sending the same key.<br />- "idempotence\\\_id" – \\<br />- "data\\\_source\\\_type" – "sdk"<br />- "data\\\_source" – "flutter-sdk"<br />- "data\\\_source\\\_version" – \\ |

## Returns

This method does not provide return values but sends event data to the Optimizely Data Platform (ODP) server.

## Example

```dart
Map<String, String> identifiers = { 
   "fs_user_id": "user123", 
   "email": "user123@optimizely.com" 
}; 
Map<String, dynamic> data = {"item": "shirt", "price": 50.00}; 
await flutterSDK.sendOdpEvent("purchased", type: "fullstack", identifiers: identifiers, data: data); 
```

The following diagram shows the network calls between your application, the Flutter SDK, and the ODP server when calling the `sendOdpEvent` method:

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/OT1aRuZfv1u0HUeodCE7j_ceeba02-aat-network-diagrams-flutter-sendodpevent.png)

1. Your application calls the `sendOdpEvent` method.
2. The Flutter SDK makes a POST request to ODP.
3. ODP responds with acknowledgment or relevant error.

## Source files

The language and platform source files containing the implementation for the Flutter SDK are available on [GitHub](https://github.com/optimizely/optimizely-flutter-sdk/blob/master/lib/optimizely_flutter_sdk.dart).