WooCommerce: Allow adding multiple products and set price to the cart via the add-to-cart query string

functions.php

application/x-httpd-php functions.php ( PHP script, ASCII text )
<?php
/**
 * 
 * 1. Bond Only - Expedia, Direct, HomeAway
 * https://readysethost.co/checkout/?add-to-cart=772:1:2.00&rcode=TST2&fname=Mike&lname=Aubor&email=damiike%40gmail.com
 * 2. Booking Only - Booking.com, Direct, HomeAway
 * https://readysethost.co/checkout/?add-to-cart=1334:1:1.00&rcode=TST2&fname=Mike&lname=Aubor&email=damiike%40gmail.com
 * 3. Booking Deposit Only - Direct, HomeAway
 * https://readysethost.co/checkout/?add-to-cart=1437:1:1.00&rcode=TST2&fname=Mike&lname=Aubor&email=damiike%40gmail.com
 * 4. Booking Deposit and Bond 
 * https://readysethost.co/checkout/?add-to-cart=1437:1:1.00,772:1:2.00&rcode=TST2&fname=Mike&lname=Aubor&email=damiike%40gmail.com
 * 5. Reservation and Bond - Direct, HomeAway
 * https://readysethost.co/checkout/?add-to-cart=1334:1:1.00,772:1:2.00&rcode=TST2&fname=Mike&lname=Aubor&email=damiike%40gmail.com
 * 
 * Functions: 
 * A. Multiple Products - DONE
 * B. Custom Price for multiple products - DONE
 * C.1. Custom Billing Field - DONE
 * C.2. Custom Billing Field in Orders - DONE
 * D. Force 3D secure on optional cards - DONE
 * E. Order status code - DONE
 * F. Hidden billing fields - DONE
 * G. Skip cart - DONE
 * H. Hide order notes - DONE
 * J. Custom fields to checkout - DONE
 * K. Hide checkout add-to-cart message - DONE
 * L. Thank you redirect
 * M. 3D secure card check
 * N. Clear cart parameter
 * /

/**
 * C.2. Custom Billing Field in Orders
 */
add_action( 'woocommerce_admin_order_data_after_billing_address', 'wc_custom_checkout_field_display_admin_order_meta', 10, 1 );

function wc_custom_checkout_field_display_admin_order_meta($order){
    echo '<p><strong>'.__('Reservation Code').':</strong> ' . get_post_meta( $order->id, 'billing_reservationcode', true ) . '</p>';
}

add_action( 'woocommerce_checkout_update_order_meta', 'wc_custom_checkout_field_update_order_meta' );
 
function wc_custom_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['billing_reservationcode'] ) ) {
        update_post_meta( $order_id, 'billing_reservationcode', sanitize_text_field( $_POST['billing_reservationcode'] ) );
    }
}



/**
 * D. Force 3D secure on optional cards
 */
add_filter( 'wc_stripe_require_3ds', '__return_true' );

/**
 * F. Hidden billing fields
 */
add_filter( 'woocommerce_checkout_fields', 'remove_checkout_fields', 9999 );
 
function remove_checkout_fields( $woo_checkout_fields_array ) {
 
	// unset( $woo_checkout_fields_array['billing']['billing_first_name'] );
	// unset( $woo_checkout_fields_array['billing']['billing_last_name'] );
	unset( $woo_checkout_fields_array['billing']['billing_phone'] );
	// unset( $woo_checkout_fields_array['billing']['billing_email'] );
	unset( $woo_checkout_fields_array['order']['order_comments'] );
 
	// and to remove the fields below
	unset( $woo_checkout_fields_array['billing']['billing_company'] );
	unset( $woo_checkout_fields_array['billing']['billing_country'] );
	unset( $woo_checkout_fields_array['billing']['billing_address_1'] );
	unset( $woo_checkout_fields_array['billing']['billing_address_2'] );
	unset( $woo_checkout_fields_array['billing']['billing_city'] );
	unset( $woo_checkout_fields_array['billing']['billing_state'] );
	unset( $woo_checkout_fields_array['billing']['billing_postcode'] );
 
	return $woo_checkout_fields_array;
}

/**
 * G. Skip cart
 */
add_filter ('add_to_cart_redirect', 'redirect_to_checkout');
function redirect_to_checkout() {
    return WC()->cart->get_checkout_url();
}


/**
 * H. Hide order notes
 */
add_filter('woocommerce_enable_order_notes_field', '__return_false');

/**
 * K. Hide checkout add-to-cart message
 */	
add_filter( 'wc_add_to_cart_message_html', '__return_false' );

/*
 * A. Multiple products
 */
function woocommerce_maybe_add_multiple_products_to_cart( $url = false ) {
    
    // if( !empty( $_REQUEST['add-to-cart'] ) && false === strpos( $_REQUEST['add-to-cart'], ',' ) ){ 
    //     return WC_Form_Handler::add_to_cart_action( $url );
    // }

	// Make sure WC is installed, and add-to-cart qauery arg exists, and contains at least one comma.
	if ( ! class_exists( 'WC_Form_Handler' ) || empty( $_REQUEST['add-to-cart'] ) || false === strpos( $_REQUEST['add-to-cart'], ',' )){
		return;
	}


	// Remove WooCommerce's hook, as it's useless (doesn't handle multiple products).
	remove_action( 'wp_loaded', array( 'WC_Form_Handler', 'add_to_cart_action' ), 20 );


	$product_ids = explode( ',', $_REQUEST['add-to-cart'] ); //var_dump($product_ids); exit;
	$count       = count( $product_ids );
	$number      = 0;
    
	$skip_url = site_url( '/thank-you/', 'https' ); //Thank you page
    if ( isset( $_GET['fname'] ) ) {
        $fname   = isset( $_GET['fname'] )   ? esc_attr( $_GET['fname'] )   : '';
    } 
    if (isset( $_GET['lname'] )) {
        $lname = isset( $_GET['lname'] ) ? esc_attr( $_GET['lname'] ) : '';
    }
    if (isset( $_GET['email'] )) {
        $email = isset( $_GET['email'] ) ? esc_attr( $_GET['email'] ) : '';
    }
    if (isset( $_GET['rcode'] )) {
        $rcode = isset( $_GET['rcode'] ) ? esc_attr( $_GET['rcode'] ) : '';
    }
    /*if (isset ($_GET['skip'] ))  {
		$skip = isset( $_GET['skip'] ) ? esc_attr( $_GET['skip'] ) : '';
		if (!empty($skip)) {
			wp_redirect($skip_url);
		}		
	}*/
	
    // Set the session data
    WC()->session->set( 'custom_data', array( 'fname' => $fname, 'lname' => $lname, 'email' => $email, 'rcode' => $rcode) );
        
	foreach ( $product_ids as $id_and_quantity ) { //var_dump($id_and_quantity); exit;

		// Check for quantities defined in curie notation (<product_id>:<product_quantity>)
		// https://dsgnwrks.pro/snippets/woocommerce-allow-adding-multiple-products-to-the-cart-via-the-add-to-cart-query-string/#comment-12236

		$id_and_quantity = explode( ':', $id_and_quantity );

		$product_id = $id_and_quantity[0];
		
		$product_price = $id_and_quantity[2];
		//var_dump(round($product_price));
		if(round($product_price) <= 0 ){
		    continue;
		}

		$_REQUEST['quantity'] = ! empty( $id_and_quantity[1] ) ? absint( $id_and_quantity[1] ) : 1;

		if ( ++$number === $count ) {
			// Ok, final item, let's send it back to woocommerce's add_to_cart_action method for handling.
			$_REQUEST['add-to-cart'] = $product_id;
			return WC_Form_Handler::add_to_cart_action( $url );
		}

		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $product_id ) );

		$was_added_to_cart = false;

		$adding_to_cart    = wc_get_product( $product_id );

		
		if ( ! $adding_to_cart ) {
			continue;
		}

		$add_to_cart_handler = apply_filters( 'woocommerce_add_to_cart_handler', $adding_to_cart->get_type(), $adding_to_cart );

		// Variable product handling
		if ( 'variable' === $add_to_cart_handler ) {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_variable', $product_id );
		// Grouped Products
		} elseif ( 'grouped' === $add_to_cart_handler ) {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_grouped', $product_id );
		// Custom Handler
		} elseif ( has_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler ) ){
			do_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler, $url );
		    // Simple Products
		} else {
			woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_simple', $product_id );
		}
	}
}
// Fire before the WC_Form_Handler::add_to_cart_action callback.
add_action( 'wp_loaded', 'woocommerce_maybe_add_multiple_products_to_cart', 15 );

/**
 * Invoke class private method
 *
 * @since   0.1.0
 *
 * @param   string $class_name
 * @param   string $methodName
 *
 * @return  mixed
 */
function woo_hack_invoke_private_method( $class_name, $methodName ) {

	if ( version_compare( phpversion(), '5.3', '<' ) ) {
		throw new Exception( 'PHP version does not support ReflectionClass::setAccessible()', __LINE__ );
	}

	$args = func_get_args();
	unset( $args[0], $args[1] );
	$reflection = new ReflectionClass( $class_name );
	$method = $reflection->getMethod( $methodName );
	$method->setAccessible( true );

	$args = array_merge( array( $reflection ), $args );
	return call_user_func_array( array( $method, 'invoke' ), $args );

}

/**
 * J. Autofill check-out
 */
// Autofill checkout fields from user data saved in Woocommerce session
add_filter( 'woocommerce_billing_fields' , 'prefill_billing_fields', 99999 );
function prefill_billing_fields ( $address_fields ) {
    // Get the session data
    $data = WC()->session->get('custom_data');
	// First Name
    if( isset($data['fname']) && ! empty($data['fname']) )
        $address_fields['billing_first_name']['default'] = $data['fname'];
    // Last Name
    if( isset($data['lname']) && ! empty($data['lname']) )
        $address_fields['billing_last_name']['default'] = $data['lname'];
    //var_dump( $data['lname']);exit;
    // Email
    if( isset($data['email']) && ! empty($data['email']) )
        $address_fields['billing_email']['default'] = $data['email'];
    // reservationcode
    if( isset($data['rcode']) && ! empty($data['rcode']) )
         $address_fields['billing_reservationcode']['default'] = $data['rcode'];

    return $address_fields;
}

/**
 * C.1. Custom Billing Field
 */
add_filter( 'woocommerce_billing_fields' , 'wc_custom_fields' );
function wc_custom_fields( $fields ) {
      $fields['billing_reservationcode'] = array(
 		'type'          => 'text',
 		'required'		=> true,
		'class'         => array('reservationcode'),
 		'label'         => 'Reservation Code',
		'label_class'   => 'reservation-code'
 	 );
   return $fields;
 }

/*
 * J. Autofill check-out
 */
// Get the custom "amount" from URL and save it as custom data to the cart item
add_filter( 'woocommerce_add_cart_item_data', 'add_pack_data_to_cart_item_data', 20, 2 );
function add_pack_data_to_cart_item_data( $cart_item_data, $product_id ){
    if( ! isset($_GET['add-to-cart']) )
        return $cart_item_data;

    $amount = esc_attr( $_GET['add-to-cart'] );
    if( empty($amount) )
        return $cart_item_data;
    // Set the custom amount in cart object
    $products = explode( ',',  $_GET['add-to-cart'] ); 
    $count    = count( $products ); 
	foreach ($products as $product) {
    	$id_and_quantity = explode( ':', $product );
    	if ($product_id == $id_and_quantity[0]) {
	    	$cart_item_data['custom_price'] = $id_and_quantity[2];
	    }
	}
    
    return $cart_item_data;
}

/*
 * B. Custom Price for multiple products
 */
// Alter conditionally cart item price based on product ID and custom registered "amount"
add_action( 'woocommerce_before_calculate_totals', 'change_conditionally_cart_item_price', 30, 1 );
function change_conditionally_cart_item_price( $cart ) {
    if ( is_admin() && !defined('DOING_AJAX') )
        return;
    // HERE set your targeted product ID
    foreach ( $cart->get_cart() as $cart_item ) {
        // Checking for the targeted product ID and the registered "amount" cart item custom data to set the new price
        //$cart_item['data']->get_id() == $targeted_product_id &&
        if( isset($cart_item['custom_price']) )
            $cart_item['data']->set_price($cart_item['custom_price']);
    }
}

/*
 * E. Order status code
 */
//Method to set order status failed or completed based on Stripe 3D.
add_action( 'wc_gateway_stripe_process_response', 'prefix_wc_gateway_stripe_process_response', 20, 2 );
function prefix_wc_gateway_stripe_process_response( $response, $order ){
	if($response->source->type == 'three_d_secure'){
		$order->update_status('completed', 'order_note');
	}elseif($response->source->type == 'card'){
		$order->update_status('failed', 'order_note');
	}
}

/*
 * L. Thank you redirect
 */
add_action( 'woocommerce_thankyou', 'bbloomer_redirectcustom');
function bbloomer_redirectcustom( $order_id ){
    $order = new WC_Order( $order_id );
    $url = site_url( '/orders/thank-you/', 'https' ); //Thank you page
    $mem_url = site_url( '/orders/next-step/', 'https' ); // denied page

    /*if ( $order->status == 'failed' ) {
        wp_redirect($mem_url);
    }
    else{
         wp_redirect($url);
    }*/
	if ( $order->get_payment_method() == 'bacs') {
		wp_redirect($bacs_url);
	}
	else {
		if ( $order->status == 'failed' ) {
			wp_redirect($mem_url);
		}
		else{
			 wp_redirect($url);
		}
	}
}

/*
 * M. 3D secure card check
 */
add_filter('wc_stripe_generate_payment_request', 'prefix_wc_stripe_generate_payment_request', 20, 3);
function prefix_wc_stripe_generate_payment_request($post_data, $order, $prepared_source){
	$data = WC()->session->get('custom_data');
	$post_data['statement_descriptor'] = 'RSH ' . $data['rcode'];
	$post_data['description'] = 'RSH ' . $data['rcode'];
	
    if($response->source_object->type != 'three_d_secure'){
        //$prepared_source->source_object->status = 'canceled';
        $post_data['capture'] = 'false';
        //WC_Stripe_Logger::log( 'wc_stripe_generate_payment_request canceled: ' . print_r( $prepared_source->source_object->status, true ) );
    }
    //WC_Stripe_Logger::log( 'wc_stripe_generate_payment_request response: ' . print_r( $prepared_source, true ) );
    
    //WC_Stripe_Logger::log( 'post_data response: ' . print_r( $post_data, true ) );
    
    return $post_data;
}


add_action('init', 'skip_param');
function skip_param(){
      if($_GET['skip'] == 'T'){
          $skip_url = site_url( '/thank-you/', 'https' ); //Thank you page
   wp_redirect($skip_url);
                exit();
  }
}

/*
 * N. Clear cart parameter
 */
/*empty cart if user come to homepage*/
add_action( 'init', 'woocommerce_clear_cart_url' );
function woocommerce_clear_cart_url() {
    if ( isset( $_GET['clear-cart'] ) ) {
        global $woocommerce;
        $woocommerce->cart->empty_cart();
		$skip_url = site_url( '/orders/clear/', 'https' );
   		wp_redirect($skip_url);
		exit();
    }
}