I realize this thread is old but are there any plans in the near future to add this functionality? Doing a cron to sync things up isn't ideal because as campaigns are mailed out and people unsubscribe a local database is then out of sync with Constant Contact until the next cron fires and completes sucessfully. Depending on how often you want to run said job and try to stay in sync, a developer could potentially hit some API limits in regards to playing nice.
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