---
title: Locate IDs used for APIs
slug: web-experimentation/docs/locate-ids-used-for-apis
docTags: 
createdAt: 2026-07-23T11:40:24.851Z
---

When using the Optimizely Web Experimentation APIs you will need several identifiers found in the [Optimizely application.](https://app.optimizely.com/v2)

For example:

- Creating the JSON object you use to send information to the [Optimizely Event API](docId\:Hq6lC7WxnHplkT15hOzXN).
- Exporting Experimentation Events Export data using the [Optimizely Authentication API](docId\:dThJEX0xA9-OxCTlKWH0Y).

## Account ID

Go to **Account Settings** > **Plan**. The Account ID (`account_id`) is found at the top of the page to the right of the **Account Information** section.

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/akJQ21WxF_RP1T9AREnU4_e59a1a6-locate-ids-1.png)

## Campaign ID, Experiment ID, Variation IDs, Entity IDs and keys

Go to the project you will be sending events for. Click **Experiments** > **\[your experiment name]** > **API Names**.

| Event API variable | Name on page      | Where to find in the UI                                                                                                                             |
| ------------------ | ----------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| campaign\\\_id     | Campaign ID       | Under the **Experiment Details** section.                                                                                                           |
| experiment\\\_id   | Experiment ID     | Last ID in the **Experiment Details** section.                                                                                                      |
| variation\\\_id    | Variation ID      | In the **Variations** section. The \`variation\_id\` is shown as the **ID** below the name of each variation.                                       |
| entity\\\_id       | Event ID          | In the last section, named **Events**.\ The \`entity\_id\` is listed as the **ID** below the name of each event. It is to the left of the API name. |
| key                | Events > API Name | In the last section, named **Events**.\ The \`key\` is listed as the **API Name** below the name of each event. It is to the right of the event ID. |

The following image highlights each ID shown on the API Names page.

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/F6-aN5ziCpwfSENZPJA6O_a338e58-8947f94-locate-ids-2.png)