As an event organiser, you are looking to change the commission payout of your affiliates.

You can also set default commission rates for specific tickets, addons or donations, so you can reward affiliates differently depending on what’s being purchased.
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If you want to manually update the commission percentage for some of your affiliates, such as setting a higher commission for your speakers, even at the ticket, add-on, or donation level go to the Registered Affiliates section, click (...) next to the affiliate, and then click Edit Record.
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Click Save and you're all set!