mergeProfiles 
  Runs an AWS Lambda job that does the following:
All the profileKeys in the
ProfileToBeMergedwill be moved to the main profile.All the objects in the
ProfileToBeMergedwill be moved to the main profile.All the
ProfileToBeMergedwill be deleted at the end.All the profileKeys in the
ProfileIdsToBeMergedwill be moved to the main profile.Standard fields are merged as follows:
Fields are always "union"-ed if there are no conflicts in standard fields or attributeKeys.
When there are conflicting fields:
If no
SourceProfileIdsentry is specified, the main Profile value is always taken.If a
SourceProfileIdsentry is specified, the specified profileId is always taken, even if it is a NULL value.
You can use MergeProfiles together with GetMatches, which returns potentially matching profiles, or use it with the results of another matching system. After profiles have been merged, they cannot be separated (unmerged).