A new PerfectMoney gateway in now available for Blesta. This is an early release, and they are not a fan of the USA (testing has been VERY difficult) so please give it a spin and report any issues.
To install, download the attached perfectmoney.zip unzip and upload the "perfectmoney" directory to ~/components/gateways/nonmerchant/ and visit Settings > Company > Payment Gateways to install and configure.