(Moderator)
commented
Hello,
This feature is already available in the plugin.
{CF-CustomFieldName} – inserts the contents of the custom field with the specified name. E.g. If your price is stored in the custom field “PRDPRICE” you will need to use {CF-PRDPRICE} tag.
https://docs.wpwebelite.com/social-auto-poster/social-auto-poster-setup-docs/#facebook_settings
Let me know if you want it in another way.
Thanks