When attendees are trying to apply a promotion code, they are getting the following error “An error has occurred: Must provide source or customer. Any idea’s on how I can resolve his?
I checked your site and it looks like the active theme, Impreza, is throwing a script error on the checkout page. The error is likely interfering with the promo code submission.
If you preview another theme (go to Appearance → Customize → Change theme & preview) then try a registration and submit a promo code, does the error happen then?
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