Install the attached paygw_fakepal.zip .
Log in as admin (and proceed with the installation of the new plugin if prompted)
Go to "Site administration > Plugins > Payment gateways > Manage payment gateways" and enable the FakePal plugin
Make sure that the FakePal plugin is under the PayPal plugin (if not, move it down)
Go to "Site administration > Plugins > Enrolments > Manage enrol plugins" and click on the settings link of the "Enrolment on payment" plugin
Verify that the "Currency" menu contains "United Arab Emirates Dirham"
Verify that the list of currencies is sorted