Price is not accurate

Hi, Team.
We are using other company’s plugin for payment. I inquired with the company because the payment test failed, and they said it seems to fail because your plugin manipulate the price.
the payment plugin uses “$order->get_total()” function to make sure that the price is not fabricated. But the price verification process faild because the price number which is retured by “$order->get_total()” function is rounded off to the nearest hundredths. For example, 4.95 is rounded off to 5.
Please let me know what’s needed to fix this problem.
Thanks and Regards.