The interest generated has nothing to do with where you spend it, but depends on the time and amount of your repayment.

CCB's credit card has a fixed billing date every month, and 20 days after the billing date is the final repayment date. Before the final repayment date, the consumer will be repaid in full according to the bill amount and enjoy the interest-free period. If you don't repay in full and on time, consumers won't enjoy the interest-free period, and the bank will charge interest in full at the rate of five ten thousandths per day from the date when your consumption is recorded.

Therefore, after you spend in the micro-store, there will be no interest if you repay in full according to the repayment amount before the final repayment date, otherwise interest will be generated.