/**
 * Function to check if a specific tag was applied and update user meta with the current URL.
 *
 * @param int   $user_id The ID of the user.
 * @param array $tags    An array of tags applied.
 */
function update_user_meta_with_url_on_tag_application( $user_id, $tags ) {
    // Get the tag ID for "DS - Free Course Check"
    $tag_id = wpf_get_tag_id( 'DS - Free Course Check' );

    // Check if the tag is in the array of applied tags
    if ( in_array( $tag_id, $tags, true ) ) {
        // Get the current URL's relative path from $_SERVER variables
        $current_url = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) );

        // Update the user meta
        update_user_meta( $user_id, 'url_tag_applied', $current_url );
    }
}
add_action( 'wpf_tags_applied', 'update_user_meta_with_url_on_tag_application', 10, 2 );