I tried it by editing the setting.php and edit-form.php inside the paypal folder. First, I added a new currency but I believe, there are more to do to add a new one because it was creating server error. To go around with this, I just edited one of the existing currencies and changed that to the currency I needed and it worked. I tried paying and PayPal converted the currency correctly.
Enrolment
BRL - Brazilian Reais - Paypal
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