wsafp_coupon_product_categories_filter

// Include specific categories ID's

// functions.php

add_filter('wsafp_coupon_product_categories_filter','include_cat_id_for_sponsor_a_friend');
function include_cat_id_for_sponsor_a_friend(){
       $cat_ids = array( 0 => 'CATID', 1 => 'CATID' );
       return $cat_ids;
}