How to add rewrite rule to point to file

add_rewrite_rule should choose where to write your rules to internal array of rewrite_rules or to .htaccess. If I understand logic behind this code SSLA_PLUGIN_URL is something like http://www.example.com/wp-content/plugins/plugin/… in this case you should check your .htaccess (in case if you using apache), because all external rules goes there.

You can continue to debug your redirections with debug setting of mod_rewrite.

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