Rounding total - taxes/ vat

Hi.
I have Opencart 2.0.1.1 After adding taxes to my prices I get at rounding error in total. The point is since it is only possible to add 4 digits to prices before vat/taxes(?) the total sum often can be a bit off, like this example: 179,99 while the total should be 180,- To the customer it show correctly 180,- because I have set the price to show no decimals, but when total is sent to Stripe (Visa) for processing they pay 179,99.

One solution could be to round the total variable, like just add round($variable) in PHP, but do anybody know which variable I should do this with, and where it is located?

Well, something like this could at least create 'zero-rounded' Values.
Good Luck!
Ernie