MailChimp Ecommerce360

//Send to ecommerce360
$item_array = array();
foreach($transaction->transaction_details->transaction_detail as $transaction_detail) {
    $item_array[] = array(
        "product_id" => (string)$transaction_detail->product_code,
        "product_name" => (string)$transaction_detail->product_name,
        "category_id" => 1,
        "category_name" => "Products",
        "qty" => (double)$transaction_detail->product_quantity,
        "cost" => (double)$transaction_detail->product_price,
    );
}

$order = array(
    "id" => $transaction_id,
    "email_id" => $custom_fields['mc_eid'],
    "email" => $customer_email,
    "total" => (double)$transaction->order_total,
    "order_date" => $transaction_date,
    "shipping" => (double)$transaction->shipping_total,
    "tax" => (double)$transaction->tax_total,
    "store_id" => (string)$transaction->store_id,
    "store_name" => "YOUR STORE NAME",
    "campaign_id" => $custom_fields['mc_cid'],
    "items" => $item_array,

);
$retval = $api->ecommOrderAdd($order);