In this episode, we're diving into how to enable promotion codes during checkout, but we're not just blindly following documentation—instead, I'll walk you through my process of exploring the codebase to see how things actually work. We'll start with the easy part: enabling promotion codes by using the allowPromotionCodes() method before starting the checkout process. This adds a new section in the checkout where users can enter their promo codes, and of course, you'll set up your promo codes and coupons directly in your Stripe dashboard.
But we're not stopping there! I'm also showing you how I dig deeper into the code to figure out where this functionality is set and how it's wired up. We'll poke around different traits and builders like the subscription and checkout builders. You'll get to see how the allow promotion codes setting actually gets passed through the checkout payload sent to Stripe.
Along the way, we look at customer options—like how you can pre-fill the checkout form with your user's email, name, and address. By the end, you'll not only know how to enable promo codes but also get a feel for how to read through and experiment with the code to find out all the other cool things you can tweak for your specific needs—all without needing to pore over the official docs every time.