With all the additional options for rebilling, I want clients to be able to "buy" other services as upgrades but I'd like to also have the ability to associate credits with features. Such as your credits are linked to email sending only for emails and SMS messaging. And not purchasing domains. Clients get very confused about the credits and wallet and how it all works. I don't want to "turn off" these other rebilling options, just would like to be able to assign credits to specific elements