Styjun

By checking the GUEST customer's email address against processing and completed orders, I want to give the GUEST a "first order discount" if the email has no orders. It would be nice if this could happen as the guest types in their email.

I think I've managed to make the discount code and now I am asking for help on merging these two codes, making it all work.

Here's the discount code:

add_action( 'woocommerce_cart_calculate_fees', 'first_time_order_discount', 10, 1 );
function first_time_order_discount( $wc_cart ) 

 if ( is_admin() && ! defined('DOING_AJAX') ) return;

 // discount percentage, change this into whatever you like
 // currently set to 5%
 $percent = 5;

 // calculate first order discount based on the percentage above
 $first_order_discount = $wc_cart->cart_contents_total * $percent / 100;
 $wc_cart->add_fee( __( 'First Order Discount', 'woocommerce')." ($percent%)", -$first_order_discount );

And here's the control code:

function has_bought( $customer_email )
 $orders = get_posts( array(
 'numberposts' => -1,
 'post_type' => 'shop_order',
 'post_status' => array('wc-processing', 'wc-completed'),
 ) );

 $email_array = array();

 foreach($orders as $order) 
 $order_obj = wc_get_order($order->ID);
 $order_obj_data = $order_obj->get_data();
 array_push($email_array, $order_obj_data['billing']['email']); 
 
 if (in_array($customer_email, $email_array)) 
 return true;
 else 
 return false;
 

Not sure how to merge these two into one.

To check customer (guest or not) orders from "Billing email" user live input requires Javascript and Ajax to enable (apply) a cart discount (a negative fee) on checkout page.

The complete code:

// Conditionally apply a percentage discount if customer has already make a purchase
add_action( 'woocommerce_cart_calculate_fees', 'first_time_purchase_percentage_discount', 10, 1 );
function first_time_purchase_percentage_discount( $cart ) 
 $percent = 5; // HERE set the discount percentage (float)

 if ( is_admin() && ! defined('DOING_AJAX') )
 return;

 if ( WC()->session->get( 'first_purchase_discount' ) && is_checkout() ) 
 // The First order discount percentage calulation
 $first_order_discount = $cart->get_subtotal() * $percent / 100;

 // Apply the discount
 $cart->add_fee( __( 'First Order Discount', 'woocommerce')." ($percent%)", -$first_order_discount );
 


// The Wordpress Ajax PHP receiver
add_action( 'wp_ajax_checkout_billing_email', 'get_ajax_checkout_billing_email' );
add_action( 'wp_ajax_nopriv_checkout_billing_email', 'get_ajax_checkout_billing_email' );
function get_ajax_checkout_billing_email() 
 // Checking that the posted email is valid
 if ( isset($_POST['cb_email']) && filter_var($_POST['cb_email'], FILTER_VALIDATE_EMAIL) ) 
 // Get one of customer orders from billing email
 $orders = get_posts( array(
 'numberposts' => 1, // Just one is enough
 'meta_key' => '_billing_email',
 'meta_value' => sanitize_email( $_POST['cb_email'] ),
 'post_type' => 'shop_order',
 'post_status' => array('wc-processing', 'wc-completed')
 ) );

 // If the inputed billing email is not set on a customer order we set the value to TRUE
 $value = sizeof($orders) == 0 && ! empty($_POST['cb_email']) ? true : false;

 // Set the value in custom Woocommerce session identifier
 WC()->session->set('first_purchase_discount', $value );

 // Return the session value to jQuery
 echo WC()->session->get('first_purchase_discount');
 
 die();


add_action('wp_footer', 'checkout_billing_email_js_ajax' );
function checkout_billing_email_js_ajax() 
 // Only on Checkout
 if( is_checkout() && ! is_wc_endpoint_url() ) :

 // Initializing
 WC()->session->set('first_purchase_discount', false);
 ?>
 <script type="text/javascript">
 jQuery(function($)
 if (typeof wc_checkout_params === 'undefined') 
 return false;

 $( 'input#billing_email' ).on('change blur', function() 
 var value = $(this).val();
 console.log(value);
 $.ajax(
 type: 'POST',
 url: wc_checkout_params.ajax_url,
 data: 
 'action': 'checkout_billing_email',
 'cb_email': value,
 ,
 success: function (result) 
 if( result == 1 ) 
 // Update checkout
 $(document.body).trigger('update_checkout');
 
 console.log(result); // For testing (to be removed)
 
 );
 );
 );
 </script>
 <?php
 endif;

Code goes in function.php file of your active child theme (or active theme). Tested and works.

Addition:

To handle "on hold" status too, replace the following line:

'post_status' => array('wc-processing', 'wc-completed')

by this:

'post_status' => array('wc-on-hold', 'wc-processing', 'wc-completed')