Signing an installment agreement with a merchant is a matter between China Merchants Bank and the merchant. You just need to know what agreement the merchant you want to buy has with China Merchants Bank. For example, in Suning, if there are activities, staging is still free.
I'm not sure what the minimum amount is, I don't know when the consumption date is, I don't know when the billing date is, and I don't know how much interest there will be. But what is certain is that staging is more cost-effective than not staging. Generally, if it is not finished three times, it will be cost-effective in stages. If you repay more than four times according to the minimum amount, the total expenditure will be much more than the installment, and so on.