1 yuan or more. According to the inquiry of official website of Postal Savings Bank, the single transaction amount of general card and gold card of Postal Savings Credit Card is 1 yuan, with free reminder of 500 yuan, reminder of 3 yuan and deduction, and the balance changes to 3 yuan/month or 30 yuan/year. Therefore, the Postal Savings Credit Card Puka and Gold Card provide customers with SMS reminders of transactions above 1 yuan. Postal savings bank credit card, UnionPay standard RMB credit card, has rich functions such as overdraft consumption, overdraft cash withdrawal, installment payment and points earning.