Add multiplier/addition after currency conversion
Each time currency conversion were done, none-default currency were taken as is.
As exchanges always fluctuate, it is best to multiply or add certain amount after conversion to cover any possible accepted increase/decrease in exchange rates.
This may also serve as difference between different exchange. Such as when withdrawing the money, or converting to the main/sub currency,either through bank or any payment processor.
Main currency: USD
Sub currency: MYR
new MYR value to be multiplied by 1.2 as to cover any increase/difference upto 0.2 from current value.
or add MYR 0.30 (30 cents) after conversion.