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<?php 

# WooCommerce 2.6 -> 3.0 "Compatibility" Variables 

$order_id 	= ( version_compare( WC_VERSION, '2.7', '<' ) ) ? $order->id : $order->get_id();  	
$order_date = ( version_compare( WC_VERSION, '2.7', '<' ) ) ? $order->order_date : $order->get_date_created();  


$billing_first_name = ( version_compare( WC_VERSION, '2.7', '<' ) ) ? $order->billing_first_name : $order->get_billing_first_name(); 
$billing_last_name 	= ( version_compare( WC_VERSION, '2.7', '<' ) ) ? $order->billing_last_name : $order->get_billing_last_name(); 

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$.ajax({
     type: "POST",
     url: 'https://blissco.sandbox.onample.com/api/v1/users/login',
     data: 'username=user&password=pass',
     success: function(data)
     {  
     
	  let headers = new Headers();
  	  headers.set('Authorization', 'Basic ' + btoa("key:secret"));
      headers.set('Content-Type','application/json');

goranefbl

Example code using react-filepond and multer to upload files to a server

https://pqina.nl/filepond/

https://github.com/expressjs/multer

goranefbl

/**
 * Add the field to the checkout
 **/
add_action('woocommerce_after_order_notes', 'my_custom_checkout_field');

function my_custom_checkout_field( $checkout ) {
	
	echo '<div id="my_custom_checkout_field"><h3>'.__('My Field').'</h3>';
				
	/**