Which action is utilized for merging two loyalty program memberships?

The action specifically designed for merging two loyalty program memberships is merging loyalty program memberships. This process typically involves combining the benefits, points, and account information of two different loyalty memberships into one, ensuring that the member retains their accumulated rewards in a single account. This is particularly useful in scenarios where a member has multiple accounts but wishes to consolidate them for easier management and enhanced usability of their loyalty benefits.

The other options relate to different functionalities within the loyalty management system. For instance, updating progress for cumulative promotion usage pertains to tracking promotion participation and is not involved in merging memberships. Transferring member points to groups is focused on redistributing points within particular groups or teams, rather than merging memberships. Unmerging loyalty program memberships suggests a reversal process when a previously merged account needs to be separated again, which does not relate to the direct merging process itself. Thus, merging loyalty program memberships is the correct action for combining two memberships.