Quick Export : reorder columns

// functions.php

function my_custom_csv_order($keys)
{

	/* to reorder : just change the order of the keys here.
	 * except for the fields "others" : their position is fixed.
	 */

	$keys = array(
		//general
		'id', 'status', 'order_date',

		//billing infos
		'billing_first_name', 'billing_last_name',
		'billing_company', 'billing_address_1', 'billing_address_2','billing_city',
		'billing_postcode', 'billing_country', 'billing_state', 'billing_email',
		'billing_phone',

		//shipping infos
		'shipping_first_name', 'shipping_last_name',
		'shipping_company', 'shipping_address_1', 'shipping_address_2',
		'shipping_city', 'shipping_postcode', 'shipping_state', 'shipping_country',

		//note
		'customer_note',

		//payment, shipping and total
		'shipping_method_title', 'payment_method_title', 'order_discount',
		'cart_discount', 'order_tax', 'order_shipping', 'order_shipping_tax',
		'order_total', 'order_tax_detail', 'completed_date',

		//others
		'number_of_different_items',
		'total_number_of_items',
		'used_coupons',
		'coupon_name',
		'coupon_discount'
	);

	return $keys;
}

add_filter( 'wqep_included_order_keys_filter', 'my_custom_csv_order' );