Paypal not converting on checkout

[MangoPolo]

   I have 3 currencies on my website. A local one, Euro and USD. When I checkout with any of these , Paypal shows on its page the same amount but only in Euro. If the product costs 200 units of local currency ( the conversion rate is 20 ) well... paypal will do the checkout as 200 Euro. And even if I check out with dollars. Paypal will show 200 Euro. Currency IDs and all settings are set well. There is something inside the paypal php file, cause it is a little modified by one of our past programists to make it able to convert . Can anyone look into my code and give me a hint of what is wrong?

 

Here is the link to the modified module. maybe someone has time to look through the php... I will be very thankful...

 

https://drive.google.com/open?id=0B09lLdP7JoIAbUE0VlZlbGcwazA