DEVDOCS-3615: [value add] Headless Quickstart, info about SSL/TLS cer…

…tificate (#1634)

docs/api-docs/building-storefronts/nextjs-commerce-guide.md

@@ -1,7 +1,5 @@
 # Next.js Commerce Quick Start
 
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 ## Overview
 
 BigCommerce offers cloud-based multi-channel ecommerce solutions. We also offer themes with powerful design tools and features that let you build and host your storefront on our servers.
@@ -74,6 +72,8 @@ To get started with Next.js Commerce, you'll need to deploy a live version direc
 
 ![Commerce deployment confirmation dialogue](https://raw.githubusercontent.com/bigcommerce/dev-docs/master/assets/images/nextjs-commerce-14.png)
 
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 ### Developing locally after Vercel deployment
 
 1. Visit the Git provider where Vercel created a new repository. Clone that repository locally.
@@ -158,6 +158,10 @@ SWR uses FETCH for data fetching: [vercel/fetch: Opinionated fetch (with retryin
 
 ## Application settings
 
+### SSL/TSL Certificate
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+To use BigCommerce's [redirected checkout](https://developer.bigcommerce.com/api-docs/storefronts/guide/checkout#redirecting-to-the-bigcommerce-checkout), make sure your Next.js Commerce storefront has an SSL/TSL certificate installed and you are using URL beginning with `https://`.
+
 ### Next SEO
 
 Next.js Commerce includes the [Next SEO](https://github.com/garmeeh/next-seo) plugin to simplify SEO settings so that Next.js Commerce appears correctly in search results and is more readily shareable on social media. To learn how to configure Next SEO settings, visit the [Next SEO GitHub repository](https://github.com/garmeeh/next-seo).