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Then, it immediatlely repopulates the list using the Import Contacts (JSON or Multipart) bulk activity endpoint with the contact data stored on in the local CRM or other contact/customer manangement application.
Wiping out a list and then adding local contact data that has not been synced with Constant Contact to the now empty list will ignore any preference changes that a contact made to their profile.
It is fine to use this process if you are adding a fairly small number of contacts.
Keep in mind that API keys have a limit on the number of API calls that can be made per day, and per second. If you are adding a large number of contacts, it's best to use the batch import methods described below.
Whenever a contact subscribes to a contact list by entering their email address and clicking Subscribe me, This process uses 2 API calls to update a contact, one to get the current contact properties, and one to put the updated properties.
See Opting Contacts Back in to learn how a contact can change their status from OPTOUT to ACTIVE.
The contact has been removed by the account owner, and they can be added to a list at any time.
The process described here imports all contacts in your local application or database to Constant Contact, regardless of whether they are: it assumes that your local data is being synced with Constant Contact data on a regular basis.
This is important because this method will overwrite any preference changes made by a contact in the Constant Contact data, such as list subscriptions, that are not recorded in the local data.
If you are have a large number of contacts that you need to compare and update, see Updating many contacts efficiently.