Enable Adobe Analytics tracking for a Custom built Channel

Hello,

We are using inApp channel using custom js connector to send communication to client's application. The channel is working fine and now we are looking to integrate the existing Adobe Analytics connector to the links we are using in the inApp delivery. 

However, when adding the analytics connector to inApp delivery(which is custom built) it couldnt append the parameters like cid, bid, etc to the urls and we are facing "message.delivery" undefined error which tells us that the delivery couldnt retrieve the analytics related personalisation fields for the urls from the backend as it do for the email delivery.

The cid, bid values are getting populated if we maually pull the message.delivery fields into the delivery content but not when using a new delivery.

Do you have any idea what we are missing here? How to link the delivery template to pull the message.delivery schema attributes by default(as like in email channel)?

Thanks,

Annie.