2. I thought you mean plugin customization.
There are of course shortcodes. You can find them very easily:
Right on the settings page: https://i.imgur.com/VSDHLRw.png
Top of the settings page: https://i.imgur.com/Yr3Niz7.png
Shortcodes Documentation: https://goo.gl/RhDR0F
PHP Shortcode Documentation: https://goo.gl/8NlmBq
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