@deron
To add a parameter to a URL using .htaccess without breaking in WordPress, you can use the following code snippet in your .htaccess file:
RewriteEngine On RewriteCond %{QUERY_STRING} !(^|&)your_param_here=[^&]+ RewriteRule ^(.*)$ /$1?your_param_here=value [R=301,L]
Replace "your_param_here" with the name of the parameter you want to add and "value" with the value you want to assign to the parameter.
Make sure to test this code on a staging site before implementing it on your production site to ensure that it works as expected and doesn't break anything.