A concern came up in the surveys I wanted to address. Someone claimed they aren’t getting two books as part of Reverse Sage Tier.
You only get one code. The code works multiple times. If you are Reverse Sage, your code will work twice. If you’re Onaniphile, it works three times.
So, you don’t have two codes, you have one code that works two times.
So, add a book, enter code, buy. Add a second book, enter code, buy. As long as you’re signed in, you shouldn’t be asked for any additional information. I hope that helps.