Do you integrate with Shopify?

While we don't have a native integration with Shopify, you can connect Shopify and EmailOctopus using Zapier.  

Just go to the EmailOctopus integration page on Zapier and type "Shopify" into the "Search for apps to connect" field:

Select Shopify from the dropdown and you will then be able to connect Shopify with EmailOctopus:

Not all zaps on Zapier are free, so you should view Zapier's pricing here.