Here, it explains how to induct ChatPlus to Shopify
Copy chat window code
(1)Log into ChatPlus and click the setting button on the upper right of the management page.
(2)Click [General Setting]>[Chat window] on the left side of the screen.
(3)Copy tags within the red box in the section "Chat window".
Induct to Shopify
(1)Log into Shopify
(2)Click [Online store]>[Edit code]
(3) In the section "Layout", click ｛/｝theme.liquid
(4)Paste the code you copied before the ＜/body＞ tag.
(5)Click [Preview] and check to see if the chat is displayed.