I have 1 client and I pay for thier use
I have started another client and marked it so that that client will pay for their own use.
When I get to the part about testing for spam, instead of asking for new credit card details, it has the card I use for the other client. I don' want to change it because I want to use 2 different card and I'm afraid it will change the credit card details for the first client. How do I add another credit card for the second client?
Did you put that first credit card in under your own 'billing' login? You can edit the card for an individual client under 'Manage credit card details' in their client settings tab, and that will only be used to pay for their campaigns.