question

I want to partially update the tracking for an order, for example, an order has 3 items. I want to update each of them to have 1 tracking(total 3). How can I do that? I used the create fulfillment api with 1 item line 3 times with 3 different tracking. But on my order, I only see 1 tracking(the last tracking from the update).

Below is my code.

            $line_items = [];
            foreach (json_decode($ebay_order->item_info) as $item) {
                $temp = [];
                $temp['lineItemId'] = trim(explode('-', $item->sku)[0]);
                $temp['quantity'] = $item->amount;
                $line_items[] = $temp;
            }
            $params = [
                'trackingNumber' => $track_number,
                'shippingCarrierCode' => $carrier_code,
                'lineItems' => $line_items,

            ];
            $header = [
                'Authorization: Bearer ' . $access_token,
                'Content-Type: application/json',
                'Accept: application/json',
                'X-EBAY-C-MARKETPLACE-ID: EBAY_US',
            ];

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params));
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_ENCODING , '');
            $result = curl_exec($ch);

Any help will be appreciated.