Shopify's Underwhelming Shop Promise: Worse than Amazon Prime, and More Confusing!
One feature in the latest Shopify Editions release was "Shop Promise." It is a way for Shopify to let buyers know when an item will arrive, thus boosting conversion rates.
Here’s the TL;DR — It's not a Prime competitor and won't be soon. But if you compare yourself to Prime ("no subscription fees!") you had better be prepared for the comparison.