Depending on the plugin you're using, you could add the clickref at the point of importing the posts by appending that param to the links.
If you already have hundreds of links in your database without clickrefs, then you could access your wp_posts database table, search and replace in the post_content field;
YOURAWINID=XXXXX
with
YOURAWINID=XXXXX&clickref=YOURCLICKREF
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