Install custom e-mail-address for clients in Wix Studio - there are conflicts

Question:
[As long as I am the owner of the website of my client, my client cannot purchase a custom e-mail-address himself. If I want to do it for my client, he/she would have to give me his/her credit card data, what I do not want. When I transfer the ownership to my client, I do not get the rewards from the partner program. Is there a solution that I can keep the ownership and I do not need the credit card data from my client?]

Product:
[Wix Studio Editor]