Kliken's lead generation tool Connect was created to help users setup a direct channel of communication between their business and website visitors. Specifically by providing an offer to their business, in exchange for contact information (phone number, email, etc..)
Kliken does not have access to your point of sale system. Whether you're attempting to accept these coupons online or in store, you'll need to manually apply the coupons created to your store. Most online stores provide help center content on applying your coupons in store. Here are a few links to help get you started, depending on your website.
WiX Stores: https://support.wix.com/en/article/creating-coupons-in-wix-stores Weebly Stores: https://hc.weebly.com/hc/en-us/articles/227111587-Create-a-Coupon