Snippet to add "Order Again" button to WooCommerce order actions

add-order-again-button.php

<?php

add_filter( 'woocommerce_my_account_my_orders_actions', 'add_order_again_to_my_orders_actions', 50, 2 );
function add_order_again_to_my_orders_actions( $actions, $order ) {
	if ( $order->has_status( 'completed' ) ) {
		$actions['order-again'] = array(
			'url'  => wp_nonce_url( add_query_arg( 'order_again', $order->get_id() ) , 'woocommerce-order_again' ),
			'name' => __( 'Order Again', 'woocommerce' )
		);
	}

	return $actions;
}

?>