How to use unique coupon code with Zoho Backstage

I see that Zoho Marketinghub can create custom coupon codes. How can these custom coupon codes be used with Zoho backstage so that these codes work with event.

https://help.zoho.com/portal/en/kb/marketinghub/user-guide/lead-engagement/email-campaigns/articles/coupon-campaigns#Why_Coupon_Campaigns

Thanks,