Hey Carla,
Thanks for reaching out to us about this!
Unfortunately accounts are not transferable at the time 🙁
I think the best way to work this out is to ask your client to make the purchase and register the products under his name. Once your client finishes the buying process he can send you the site credentials over so you can download the plugins and configure the license keys in their site.
Please let me know if this might work for your case,
Best,
Nico