URL Query Arguments For Button Link

Hi,

Very nice plugin.

I have a suggestion that to support inheriting url query arguments in the set button url. This is important when you build an affiliate system on your site.

Most affiliate systems tracks referrals with URL queries, something like http://your-site/product_x/?referral=myaffiliateid. Say, you set a button link to http://your-site/product_x/ which links to the product page and if an affiliate member introduces the product with ?referral=person_a and somebody referred lands on the pricing table page, then the button link becomes http://your-site/product_x/?ref=person_a.

I just looked over your code and technically it is fairly easy to implement. Adding this line after the assignment to the $btn_link variable will let you do it.

$btn_link = add_query_arg(
    $_GET,
    $btn_link
);

Or if it is something difficult to implement, adding a filter for it would be appreciated.

$btn_link = apply_filters( 'rpt_button_link', $btn_link );

Thanks for your consideration.

https://wordpress.org/plugins/dk-pricr-responsive-pricing-table/