The co-branded experience
In a co-branded tool, a client might see your logo in a corner of the screen while the app name, sign-in page, emails and help links still belong to the vendor. It signals that you recommend the tool, which builds some trust, and it is usually simple to set up.
Co-branding suits tools that play a supporting role, such as a receipt capture app or a document request portal, where clients understand they are using a recognized third-party product and the firm does not need to own the experience. In those cases, a logo is a courtesy rather than a strategy.