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latestSwagger 2.0Private2026-08-04128286690.5 KB
Email Campaigns AB Tests

GET A/B Test Details for an Email Campaign Activity

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.

get/emails/activities/{campaign_activity_id}/abtest

Path parameters

campaign_activity_idstring required

The unique ID for the primary email campaign activity.

Response

Request successful.

alternative_subjectstring required

The alternate email subject line to use for A/B testing.

test_sizeinteger 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_durationinteger 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.

Example response

{
  "alternative_subject": "Reminder: Our Biggest Sale of the Year is Coming Soon!",
  "test_size": 30,
  "winner_wait_duration": 24
}