Direct checkout other themes

functions.php

add_filter('wplms_course_non_loggedin_user',function($link){
	$link = str_replace('">','?redirect">',$link);
	return $link;
});
add_action( 'template_redirect', function(){
    if( is_single() && get_post_type() == 'product' && isset($_GET['redirect'])){ 
        global $woocommerce; 
        $found = false;
        $product_id = get_the_ID();
        $courses = vibe_sanitize(get_post_meta(get_the_ID(),'vibe_courses',false));

        if(isset($courses) && is_array($courses) && count($courses)){
            if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
                foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
                    $_product = $values['data'];
                    if ( $_product->id == $product_id )
                        $found = true;
                }
                // if product not found, add it
                if ( ! $found )
                    WC()->cart->add_to_cart( $product_id );

                $cart_url = esc_url( wc_get_cart_url() ); 
                wp_redirect( $cart_url); 
            }else{
                WC()->cart->add_to_cart( $product_id );
                $cart_url = esc_url( wc_get_cart_url() ); 
                wp_redirect( $cart_url);
            }
            exit();
        }
    }   
});