Call MailingListService.CreateSubscriptions
Create a batch of subscriptions (max. 1000) for a given mailing list and a list of recipients (Queued)
2016-04-25 v2: Reject with validation error if duplicate recipient IDs are found
Create a batch of subscriptions (max. 1000) for a given mailing list and a list of recipients (Queued)
2016-04-25 v2: Reject with validation error if duplicate recipient IDs are found