This is something we need to round and check it.
There are two scenarios here.
For both cases we have to round it to 1500.
Lets workout this way.
$amount = 1499.94
$rounded_amount = round(1499.94); // 1500 here
ov discount = rounded_amount- amount
// here this will get the discount in both negative and positive. You should store it on ov discount. I guess it was not used from last updates. Use it by updating the code. If you need you can add discount gl for the discount given.
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