Void Shareasale commission when EDD payment is refunded

Void Shareasale transaction from EDD

function s11_void_refunded( $payment ) {
	global $edd_options;

	if ( empty( $payment->ID ) ) {
		return;
	}

	$merchant_id = $edd_options['sas_affiliate_id']; // TODO: If not using the EDD Shareasale addon, replace with your affiliate id
	$api_token = 'aflj24sadflk3'; // TODO: Set API token here
	$secret_key = 'asldkjlj12312oiksdlfksld'; //  TODO: Set secrect key

	$timestamp = gmdate( DATE_RFC1123 );
	$version = 2.9;
	$action = 'void';

	$order_num = $payment->ID;
	$order_date = date( 'm/d/Y', strtotime( $payment->date ) );

	$sig = $api_token . ':' . $timestamp . ':' . $action . ':' . $secret_key;

	$url = 'https://api.shareasale.com/w.cfm?merchantId=' . $merchant_id . '&token=' . $api_token . '&version=' . $version . '&action=' . $action . '&date=' . $order_date . '&ordernumber=' . $order_num . '&reason=ReturnedMerchandise';

	$response = wp_remote_post( $url, array(
		'method' => 'POST',
		'headers' => array(
			'x-ShareASale-Date'           => $timestamp,
			'x-ShareASale-Authentication' => hash( 'sha256', $sig ),
		),
	) );

    $body = wp_remote_retrieve_body( $response );

    if ( ! is_wp_error( $response ) && $body !== 'error' && ! is_wp_error( $body ) ) {
		if ( strpos( $body, 'Transaction Voided' ) !== false ) {
			// Add a note to the transaction
			edd_insert_payment_note( $payment->ID, 'Affiliate commision voided in Shareasale.' );
		}
	}
}
add_action( 'edd_post_refund_payment', 's11_void_refunded', 40 );