Send an invoice automatically with WooCommerce 2.x

The Question: “WooCommerce only sends invoice when triggered in the Dashboard. How to send these invoice automatically?”. Stackexchange.com WordPress Development does not allow WooCommerce questions any more. That is why i post the answer for this question here.

Add an action to your woocommerce_order_status_completed_notification or woocommerce_order_status_pending_to_processing_notification in functions.php:

function sendinvoice($orderid)
{
    $email = new WC_Email_Customer_Invoice();
    $email->trigger($orderid);
}   

add_action('woocommerce_order_status_completed_notification','sendinvoice');

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