Is there a WP plug-in that accepts a referral code at checkout without discounting a product? And a Map Locator in real-time?

Good day! I need your expertise before I make a purchase on plugins. I need TWO plugins that will accomplish these two objectives: 1.) E-commerce that will ALLOW a special code (like a coupon code BUT WON'T discount the product.) We need to track where it came from. We have affiliate stores that direct people to buy straight from us on our own website. We want to give commission to the affiliate store that referred our product etc. and needs to respectfully track it with the utmost integrity. This code represents their store the referral was made. AND 2.) We need a store locator map on our website exactly how it appears here: https://www.acehardware.com/store-locator. Thank you, anyone, for your help. The tech gurus with my hosting company referred me here.