I'm designing the UX and UI of a suite of products which are SaaS services. These products work just like Microsoft online services, or very similar to Google Apps for businesses. I'm stuck with the branding and positioning of both companies. One is the consumer of the service (which of course should be bolder and more apparent to the users), and one is the seller of the services. The logo of the seller should be there, because of marketing strategies.
Now, I'm confused about where to show and how to show logos of seller and consumer companies. Do we have any best practice for this?