How to avoid WhatsApp issue with og:image tag?
In some cases, WhatsApp doesn’t show og:image and sometimes you can avoid it by pushing og tags fairly close to the top of the <head>. If you have a similar issue you can change the priority for wp_action. Use this code to change it to 0 (default is 9).
How to add twitter:site?
You can use Simple SEO Improvements WordPress plugin, which is integrated with OG.
How to add Facebook app_id?
You can use Simple SEO Improvements WordPress plugin, which is integrated with OG. Or you can use og_array a filter to add (or modify) OpenGraph tags.
How do I configure the Open Graph plugin?
There is nothing to configure and there is no admin page. By default, it will use standard WordPress data which can populate the Open Graph. There are very simple and powerful filters that you can use to modify or extend the metadata returned by the plugin.