1. Online Banking Through official website, Postal Savings Personal Online Banking, click Credit Card-Credit Card Application-Recommend Friends, fill in the introducer information, generate a QR code, and then share the QR code to social platforms such as QQ Space and Weibo. Let friends enter the card page by scanning the QR code. 2. Mobile banking can pay attention to the Postal Savings Credit Card "Postal Savings Bank Credit Card" in the official WeChat account, and enter Ding Life-apply for a card/recommend it-I want to recommend it. After entering personal information, the system will generate a QR code, which can be saved on the mobile phone and sent to friends to scan the code at any time.