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<?php

global $woocommerce;
$mailer = $woocommerce->mailer();
// Email customer with order-processing receipt
$email = $mailer->emails['WC_Email_Customer_Processing_Order'];
$email->trigger( $order_id );
// Email admin with new order email
$email = $mailer->emails['WC_Email_New_Order'];
$email->trigger( $order_id );

?>