Every country+operator has a different commission or "discount" applied to your account. For every transaction that you process successfully, your commissions will be automatically applied to your account with the formula Balance-Sales+commissions.

I.e.
If you have $100 balance on your account, you make a $10 transaction and your commission is 15%, then your balance will be deducted only by $8.50 (instead of $10). You new balance is $91.5

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