PayPal Express Checkout is the faster, easier and more secure way to send and receive money without sharing financial information. This app is not PCI certified and is provided as a developer tool. It requires further development to enable the application and requires certification for use. Optimizely does not provide this certification and is not responsible of PCI certification.
The Commerce Module for PayPal Express Checkout is installed as payment provider and is configured through Optimizely Commerce. PayPal has already been pre-integrated by Optimizely, so accepting PayPal is very easy – the integration is simple and there's no programming required.