Hi Wenjiang,
Connector Xpress is the way to develop connectors on the fly, it has a built in set of possible connectors such as SQL, LDAP etc..
If your connectivity to Facebook Workplace can't use any of these underlying predefined connectivity then you will need to use the API to develop a whole new connector by code , if that's what you prefer.
You can find more in our Bookshelf guides , both in the Connectors Guide, and Developer's Guide.
Regards,
Sagi