PayPal has Mandatory PCI Compliance.
PowerStore can use PayPal Pro.
PowerStore was built with eCart.
If you go to PayPal's list of Website Payments Pro Shopping Carts:
You will find WebAssist eCart listed.
The problem is that you have not responded YES or NO.
I have to have ALL the nodes compliant in order for our store to be compliant, PowerStore is one of them.
By the way, I talked to paypal earlier today and they told me to ask you. There is no where in the webassist web site where PCI compliance is listed as one of the features.