Web Shipping Javascript SDK by ShipRush - Passing crentials

I have developed (and have customers using) a wrapped interface to ShipRush using the Web Shipping Javascript SDK. A few customers are creating second ShipRush accounts. Currently the only way they can change accounts requires logging out of the current account and logging back in.

Does the Web Shipping Javascript SDK support passing credentials? This would allow server side configuration on my part to pass the proper credentials and prevent the customer from logging into the wrong account based upon information in the local database.


thanks,
Pat