When paying online, some websites can directly apply for installment, such as Alipay, and the interest rate of installment is lower than that of banks. When you meet this kind of website, you can choose installment directly when you pay.
If you can't directly installment, you can apply for bank consumption installment or bill installment later. If it is a single transaction with an amount exceeding 1 000 yuan, you can apply for consumption installment before the bill is settled. If it is divided into several small payments, and 90% of the total amount exceeds that of 500 yuan, you can apply for bill installment after the bill is settled.