Add a fee to an order programmatically in Woocommerce 3

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The WC_Abstract_Legacy_Order method add_fee() is deprecated and set_fee() method doesn’t exist for the WC_Order Class (exist only for WC_Cart and WC_API_Orders classes).

To add a Fee to an order programmatically since Woocommerce 3, it’s a bit more complicated. There are some parameters to set as the Fee name, the tax status, the tax class (if needed) and the fee amount (excl. taxes).

Also to make the tax calculations, depending on the taxes settings, you will need to set an array containing at minima the customer country code (if the taxes are based on the country)

Let say that the fee amount variable name is $imported_total_fee in the code below:

$order->set_date_created($creation_tsz);

$order->set_address( $address, 'billing' );
$order->set_address( $address, 'shipping' );
$order->set_currency('GBP');

## ------------- ADD FEE PROCESS ---------------- ##

// Get the customer country code
$country_code = $order->get_shipping_country();

// Set the array for tax calculations
$calculate_tax_for = array(
    'country' => $country_code, 
    'state' => '', 
    'postcode' => '', 
    'city' => ''
);

// Get a new instance of the WC_Order_Item_Fee Object
$item_fee = new WC_Order_Item_Fee();

$item_fee->set_name( "Fee" ); // Generic fee name
$item_fee->set_amount( $imported_total_fee ); // Fee amount
$item_fee->set_tax_class( '' ); // default for ''
$item_fee->set_tax_status( 'taxable' ); // or 'none'
$item_fee->set_total( $imported_total_fee ); // Fee amount

// Calculating Fee taxes
$item_fee->calculate_taxes( $calculate_tax_for );

// Add Fee item to the order
$order->add_item( $item_fee );

## ----------------------------------------------- ##

$order->calculate_totals();

$order->update_status('on-hold');

$order->save();

Tested and perfectly works.

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