I just started using Paypay recently and found that there is a support local campaign ongoing that has default 10-20% cashback on points when you pay with Paypay. You can check the available stores on the 近くの得 menu map and filter it via campaign. It changes every month so it's better to keep track of the cities and schedules on their website.
Campaign cashbacks in Tokyo:
Shinagawa = 20%
Nishi Tokyo = 10%
Nerima = 20%
by MajiKaYo1995