Square is a US-based payments and point-of-sale platform founded by Jack Dorsey. It offers hardware (Card Reader, Terminal, Register), SDKs for in-person and online payments, invoicing, Cash App peer-to-peer payments, appointments, and merchant capital services. It supports credit/debit cards, digital wallets (Apple Pay, Google Pay), and e-commerce integrations.

Square does not support processing payments in mainland China. Its operations are limited to US, CA, UK, AU, IE, JP, and FR, and hardware is certified only for the country of account registration. Square Reader and online payment endpoints fail in China, and its app cannot process domestic card transactions. Chinese developers and merchants targeting global customers can use Square internationally, but must adopt domestic gateways like AliPay HK, WeChat Cash, or UnionPay QuickPass for domestic Chinese payments.

The information regarding service availability in China is provided for general reference purposes only. Due to the dynamic nature of network conditions and regulatory environments, the actual accessibility of these services may vary over time and by location. Users are advised to verify the current status independently.