What you mean by "...The other transition of test activity can have a JS code which triggers an email confirmation delivery, or a Message Center SOAP call (reference: Message Center) that sends out a (subscription) confirmation email to recipient of choice (European)." What is Message Center SOAP call?

Hi, Your documentation states:"SubscriptionsYou can add controls to allow users to subscribe to or unsubscribe from one or more information services (newsletters, warnings, real-time notifications, etc.). To subscribe, the user checks the corresponding service.To create a subscription checkbox, click Advanced controls>Subscription.Indicate the label for the checkbox and select the information service concerned using the Service drop-down box." But we want to include an opt-in to a Service in our...

Great! Thank you!Jae

Where under Web Applications can I find Register recipients?  

What about the image, was this his development as well, or can it be found in the documentation?:

Hi vtttanhua,Do you know where in Adobe Campaign's documentation you found this?Thanks,Jae