PayPal (abbreviated as PP) is a popular free online credit card service, now open to nearly 40 countries including China. PayPal payments will become one of the main methods for receiving money online in the future, and I strongly recommend joining (but if you don't want to, there's nothing I can do about it). Note that you need to fully activate your account, which requires having a Mastercard or Visa card. However, not having one is also fine. An unverified account only has limitations on the transaction limit, but it does not affect usage. Whether the PayPal account is verified or not, there is no limit to the number of payments you can receive. However, for unverified accounts, the maximum amount you can spend each month is limited to $100.