---
title: "GET A/B Test Details for an Email Campaign Activity"
method: GET
path: "/emails/activities/{campaign_activity_id}/abtest"
tags: ["Email Campaigns AB Tests"]
---

# GET A/B Test Details for an Email Campaign Activity

`GET /emails/activities/{campaign_activity_id}/abtest`

Use this method to get A/B test details for a primary email campaign activity, such as the alternate email subject line, the contact test percentage size, and the number of hours to wait to determine the winning subject line to use. Currently, A/B tests support subject line only.

## Path parameters

- `campaign_activity_id` string, required

## Response `200`

Request successful.

- ABTestData
  - `alternative_subject` string, required — The alternate email subject line to use for A/B testing.
  - `test_size` integer, required — The percentage of contact recipients to participate in the A/B Test. For example, if the value is 30, then 30% of contacts will receive the email campaign with subject line A, and 30% of contacts will receive the email campaign with subject line B. Valid values include <code>5</code> to <code>50</code> percent. Currently, A/B tests support subject line only.
  - `winner_wait_duration` integer, required — The number of hours Constant Contact waits after the A/B test is sent before determining the winning subject line. The winner is the subject line with the highest number of contact opens. Valid values include <code>6</code>, <code>12</code>, <code>24</code>, and <code>48</code>. After the winner is determined, Constant Contact automatically sends the email campaign with the winning subject line to all the remaining contacts, which did not participate in the A/B test.

## Other responses

- `400` — Bad request. Either the JSON was malformed or there was a data validation error.
- `401` — The Access Token used is invalid.
- `403` — Forbidden request. You lack the necessary scopes, you lack the necessary user privileges, or the application is deactivated.
- `404` — The requested resource was not found.
- `409` — Conflict. The resource you are creating or updating conflicts with an existing resource.
- `429` — Too many requests. You exceeded the request rate limit.
- `500` — There was a problem with our internal service.

---

[API](https://skmtc.net/cc/apis/appconnect-v3.md) · [All operations](https://skmtc.net/cc/apis/appconnect-v3/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/cc/appconnect-v3/revisions/4b4a534c818d/schema)