(you lose a lot of space for furniture when you have stairs access on all the sides. consider a rail on 2 adjacent sides so that there is room for a table and chairs without anyone going over the edge.)

Are you installing all this yourselves? If you can get the advice of an experienced mason who has experience with drainage issues, you really need to!

Did you ever find a solution to this? we just encountered the same thing and the wall is not level with the pavers.

We were less than a year in the house when we started the project. Turns out one of our neighbors behind us has a landscaping company. After watching us fumble around for a couple months with demo and digging, he came over and help us set the strings; level up against the house, then sloped the wall, if I remember right, 1" per 5', so approx 3" drop to the end of the patio at 16'. Pavers are flush to the wall cap stones. The slope is small enough you can set a glass on the table and hardly notice. We used pavers for the top, and they're not perfectly even so last winter (we're in Seattle so winter is all rain), we did have puddles forming in certain spots. Not sure if a greater slope would have mitigated that or if it's just what to expect with pavers.

We are also in Seattle and need build a retaining wall around the patio. We need to slope the pavers, but can't have them be anything but flush with the wall caps to eliminate trip hazards. Seems the only solution is to slope the retaining wall top slightly as well - but I keep reading that the top of the wall needs to be perfectly level or it will fail. After 6 years, I am curious how your patio is holding up.