Checkout API is now Generally Available 
Developers looking for an online payment API that requires: minimal coding, offers multiple payment methods and can be integrated into any workflow can get that and more using Checkout API.
Start building with Checkout API today to integrate payments into any workflow and any channel.
Notice of Upcoming Retirement
The Checkout API CreateCheckout endpoint was deprecated on 2022-08-17 and replaced by the CreatePaymentLink endpoint. To access all the newly available Checkout API features we encourage you to migrate as soon as possible by following this step-by-step migration guide. The CreateCheckout endpoint will be fully retired on 2023-04-02.
Pay Pay in Terminal API 
Square has added support in Terminal API for PayPay, the leading QR-code wallet in Japan.! This allows sellers to manage all of their sales in one place using our all-in-one payment acceptance and POS capabilities. With this release, Square now offers the ability for developers and partners in Japan to integrate PayPay into their in person payment flow through Square Terminal API.
Get started: Read the docs.