Will there be any risk to VirtueMart store's operation during shipping plugin installation?
The FedEx shipping plugin installation will not pose any risk to your VirtueMart store's operation and can be performed during off-peak hours. Address validation functionality1 may involve additional frontend customization which we will perform.
1) Please note that installation of address validation on onepage checkout system may require additional coding that is outside the scope of our installation services. When modifications are needed we will charge $30/hr in order to get bring the shopping cart to the state that it is able to validate addresses and store those validated addresses appropriately.