I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
It looked like DC comic codes were going to force mr to split up my comics by using another app that was their own. Instead, the new Cyborg told me to go to a redemption site to put in my code - a site that had me log in via Amazon. Which can be tied to my Comixology account; it has been for quite a while in fact.
The top tier titles are less per comic but come out twice a month. They don't have codes. Cyborg and Blue Beetle are a dollar more and come out once per month and have a code included. A big thanks to DC for making this so easy!