we want to add 3 Digit Unique Number ( Identify Number ) into Total Payment in our magento website.
this identify number will only available if Bank Transfer Payment selected.
in example. if the total payment is Rp 150.000 and Bank Transfer payment selected, it will generate 3 Unique Number to the total payment. so the total payment will be Rp 150.160
these 3 Unique numbers starting from 100 - 500, the numbers will be in sequence for every Bank transfer order. and if the number reach 500 it will return to 100.