mp-subscriber parameters become available whenever the trigger that starts the workflow provides a mp-subscriber object.
|first_name||Subscriber first name|
|last_name||Subscriber last name|
|Subscriber email address|
|status||Subscribers current status (Unconfirmed, Subscribed, Unsubscribed, Inactive, Bounced, Trash)|
|field||The value of any MailPoet custom field associated with the subscriber, i.e. submitted in an additional field on the sign-up form or added manually by an administrator.|