Is there a way to assign payment sources by job instead of just to the account globally?

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Some of my clients (I run an ad agency) are willing to pay for jobs directly on their credit cards. It appears that UpWork only charges one, primary payment source for all active jobs you have going. Having the ability to assign a unique payment source to each job independently would be very helpful and a nice upgrade. Perhaps this is possible, and I'm not seeing how. Any thoughts would be appreciated.