Along with the release of Prepar3D v5, Orbx has restarted accepting Paypal as a mean of payment.
Orbx had dropped Paypal for payment since December 2016 after several problems occured with their account (see here for further explanations). This will please many users who for various reasons prefer using Paypal.
The Paypal payment service is only available for payment through Orbx Central, and for those users who have opted-in Fastlane. See here for further explanation of this process.