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