oftentimes clients will book appointments for their kids, spouses, parents, friends, etc. and want to pay for the service, but we don't want to put their credit card on someone else's file. right now that's our only option, or we have to book under the paying client's name (which causes confusion for service providers and makes their appointment history inaccurate), or we have to add a $0 service for the paying client just to add their name to the invoice. this is too complicated and we should be able to add a separate person as a paying client so we can use their credit card on file.