If your WeChat was registered outside China Mainland, you can activate the WeChat Pay for China Mainland as follows:
1. Receive a Red Packet or a Transfer from one of your Chinese contacts.
2. Follow the instruction to complete the real-name authentication within 24 hours and bind a bank payment card (debit or credit card) issued in China Mainland.
3. You can check your balance by going to Me > WeChat Pay > Balance.
According to regulations of the People's Republic of China, including the Administrative Measures for the Payment Services Provided by Non-financial Institutions, the Administrative Measures for Anti-Money Laundering and Combating the Financing of Terrorism for Payment Institutions, and the Administrative Measures for the Web Payment Services Provided by Non-bank Institutions that came into effect on July 1, 2016, real-name authentication is required to for users of WeChat Wallet (RMB) to ensure payment security and protect the legitimate rights and interests all payment users so that they can enjoy more comprehensive and secure payment services.Therefore, after receving a red packet, the authentication must be completed by adding a debit card opened in Mainland China within 24 hours. If the real-name authentication has not been completed, the red packet will be returned.