Address list not updating
Inactive subscribers will not be resubscribed unless value and associated welcome and confirmation emails are identical to adding a subscriber, and should therefore be treated with the same caution.
However, if you specify the Allows you to add many subscribers to a subscriber list in one API request, including custom field data if supplied.
By default, resubscribed subscribers will not restart any automated workflows, but they will receive any remaining emails.
However, if you specify the Updates any aspect of an existing subscriber, including email address, name, and custom field data if supplied.
Date type custom fields may be cleared by passing in a value of “0000-00-00”.
New subscribers only will be sent the follow-up email as configured in the list settings.
HTTP/1.1 200 OK Content-Type: application/json; charset=utf-8 [ "(GMT) Casablanca", "(GMT) Coordinated Universal Time", "(GMT) Dublin, Edinburgh, Lisbon, London", "(GMT) Monrovia, Reykjavik", "etc..." ] Contains the current date and time in your account’s timezone.
If you do not pass through all the options that you wish to have selected for that customer, all historically selected options will be replaced with what’s included in your most recent call.
Multi-Valued Select Many custom fields are set by providing multiple custom field array items with the same key.
If a subscriber (email address) already exists, their name and any custom field values are updated with whatever is passed in. The call will only return back once all subscribers have been added.
Any missing custom field values will remain unchanged.