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**Type**: boolean[ ]


sessionIdStringID of the session
recipientListIdslong[ ]IDs of the recipient lists
recipientIdStringID of the recipient

**Return values**

For each recipient list:

  • true: Recipient already exists

  • false: Recipient does not exist or an entry exists but the opt-in process has not been finished yet (i.e., the double opt-in link has not been clicked)

**Code structure**