Checkout Extensibility enables Shopify Plus users to create checkout customizations that are built into apps.

Highly beneficial if you are looking to enhance your checkout with added functionality, grow conversions, increase average order value etc etc.

Sounds great, but like any roll out there are issues. If you’re a Shopify Plus customer you may already be well aware of this upgrade, but so far Shopify hasn’t sent much in the way of notification to its users. This reminds me of Google’s tenuous sunsetting of Universal Analytics (Hopefully you’ve heard about that by now too!).