Add Payment Method Column to Admin Orders

woocommerce-show-payment-method.php

<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

add_filter( 'manage_edit-shop_order_columns', 'wps_add_payment_method_column', 20 );
/**
 * Add payment method column
 */
function wps_add_payment_method_column( $columns ) {

	$new_columns = array();

	foreach ( $columns as $column_name => $column_info ) {

		$new_columns[ $column_name ] = $column_info;

		if ( 'order_total' === $column_name ) {

			$new_columns['order_payment'] = __( 'Payment Method', 'my-textdomain' );

		}
	}

	return $new_columns;

}

add_action( 'manage_shop_order_posts_custom_column', 'wps_add_payment_method_column_content' );
/**
 * Add patment method comumn content
 */
function wps_add_payment_method_column_content( $column ) {

	global $post;

	if ( 'order_payment' === $column ) {

		$order = wc_get_order( $post->ID );

		echo $order->payment_method_title;

	}
}