MATOMY: Setting up multiple vendors using tracking

Paul has been running email campaigns with Matomy. I’ve been setting them up for a few months now, but he has only had 1 vendor running them all (Dale). He is interested in bringing in more vendors to run them, but I need a way to track the different vendors so I can keep track of billables. There is a tracking section with each campaign, but I am unsure how to use it. When you get a chance, can you take a look? Thanks

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