Couponic Payment Gateway Modify ! Easy

Please, only bid if experienced with couponic. My problem is. my country currency is RD$ . DOP . thats the way i setted in couponic. i setted everything ok with paypal on the admin. the first thing happening is.. credit card processing is not going thru. the second big problem is. if i have a deal which is RD$500 , when clicking on buy and try to pay with paypal. Paypal gets it as if it was USD 500. ( in dollars). So, even i have setted up my currency as DOP. paypal is getting it as if it number sent to them is dollars and does not make an automatic conversion. So, i think i need to modify the payment module with some automatic currency conversion from DOP to USD before charging by credit card or paypal. basicly, my users need to their prices in DOP but when charged by credit card or payola it needs to be done in USD. I have tried haxoring it myself a bit, messing in the [login to view URL] but i get errors like. Order quantity / amount does not match..