I should have mentioned (quoting CC):
“ , for all NERmembers that participate in this group order and purchase one of these jerseys, we will extend a 10% discount on our online collection. We'll ship those items along with their NER jersey, with no additional shipping costs. The code they'll need to use to apply the discount is NER10. This code can be enter during checkout.
They have been applying the discount retroactively to orders already placed, but it’s more reliable for us to use the discount code