Creating a custom branded meeting where i am not the host

[TW3]

My client is looking at creating custom branded meetings for interviews that they set up, I have looked into this subject extensively but because of my lack of knowledge of zoom terminology, I'm not sure if I'm finding the right solutions. 

what they are looking to do is:
- set up a meeting between two clients not under their admin account 

- those two clients be able to see their banding so that they know the meeting has been hosted by them 

- ideally, they would have their custom zoom background 

I'm aware that there are branding opportunities in terms of a custom URL and maybe a logo but the background I have no idea if this is even possible. if you have any answers about the other bits of branding I could do and if this is possible if I'm setting up a meeting between two people and not hosting the meeting. thank you.