As a Shopify user it would be fantastic to have a Klaviyo Integration and be able to see and edit subscriber info along side Shopify info (and Klaviyo being the of the most used mail platforms for Shopify that many chat platforms integrate with). Here is an example of how a competitor integrates with it: https://www.gorgias.com/ecommerce/klaviyo
Klaviyo a very good with partnerships and integrating them would open you up to a lot exposure through their partner network;
https://developers.klaviyo.com/en
John