How to allow premium options for all of my users if embedding the express SDK

I have a video editor feature within my platform that I would be interested in replacing with Adobe Express Embed SDK. However, I don't want to have my users have to create accounts and pay to upgrade for the premium features. Instead, I'd like to be able to pay for the premium seats on behalf of the client so they won't have to create accounts or log in. Is that possible?

Also, what level of customization is possible? Would I be able to have different brand spaces for each client and load different assets for them.

Would love to have a call with someone if possible.