We'll create fresh WordPress site with Gist API Code insert installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Unlike the standard embedding method that use script like this
<script src="https://gist.github.com/..."></script>
to embed gist code, Gist API Code insert plugin inserts code directly in to your posts using simple shortcode and highlights it with prism code highlighter.
Examples
Add all files from a gist:
[apCI id="123456789"]
Add single file from a gist:
[apCI id="123456789" file="filename.php"]
Add single file from a gist with raw file link:
[apCI id="123456789" file="filename.php" raw="yes" ]