When working with generated archive pages, it can be difficult to get all the Open Graph tags that you want to be added to a specific archive page.
Specifically, when using a plugin like Yoast SEO to manage Open Graph tags, there is no way to set custom Facebook Open Graph image tags to appear on an archive page like the one we use for our main Coupon Archive Template.
That’s why we have an option to set custom images for Facebook that will be printed out as Open Graph tags specifically on the Coupon Archive Template.
This is only relevant when using our Coupon Archive Template and does not apply when using the archive shortcode on a regular page.
Also see WP Coupons Twitter image meta tag.