Just one day after Google made it possible to purchase Google Play credits directly from the desktop website, it also began to roll out a new wishlists feature in the Google Play Android app. Wishlists are comprised of bookmarks that that remind you to revisit content you may want, but can’t download at the time.
You can add any piece of content on Google Play to your wishlist. It doesn’t even matter if it’s free or not. Afterwards, you can go to the My Wishlist page to see everything you saved.
At this time, your wishlist can only be seen by you. There is an expectation that Google will allow wishlists to be shared at some point. Perhaps that feature will roll out alongside the ability to gift Google Play content to someone. That’s merely speculation of course, but I see no reason why that shouldn’t be implemented.