Global configuration parameters affect all App modules and can be configured on the Configure page using the General button.
Managing the PayPal account API Credentials
App modules that have already been enabled can be configured using their respective configuration buttons. Additional App modules can be enabled using the Install button and selecting from a list of available modules to install.
Installing additional App modules
After a new module has been installed, it performs requirement checks to make sure the module can be enabled on the store. If any requirements are not met, the module remains in a disabled state until the requirement has been fixed.
Notification of a requirement for a new module
In the image above, a notification is displayed due to missing API Credentials. The module will remain in a disabled state until the Live credentials have been entered or the module has been configured to use the Sandbox credentials.