[ozgur-sar]

You can use woocommerce_order_status_completed hook and WC_Email_Customer_Invoice

add_action( 'woocommerce_order_status_completed', 'mysite_woocommerce_order_status_completed', 10, 1);

function mysite_woocommerce_order_status_completed( $order_id ) {
   // Send invoice email to customer
   //use order ID as trigger value
   WC()->mailer()->emails['WC_Email_Customer_Invoice']->trigger($order_id);
}

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