docs/OrderItem.md in ultracart_api-3.6.1 vs docs/OrderItem.md in ultracart_api-3.6.3

@@ -50,9 +50,10 @@
 **tags** | [**Array<OrderItemTag>**](OrderItemTag.md) | Tags | [optional] 
 **tax_free** | **BOOLEAN** | True if the item is tax free | [optional] 
 **taxable_cost** | [**Currency**](Currency.md) |  | [optional] 
 **total_cost_with_discount** | [**Currency**](Currency.md) |  | [optional] 
 **total_refunded** | [**Currency**](Currency.md) |  | [optional] 
+**tracking_number** | **String** | Tracking number, if null or missing, use order level tracking number(s). Used if there are multiple shipments for one order | [optional] 
 **transmitted_to_distribution_center_dts** | **String** | Date/time that this item was transmitted to the distribution center | [optional] 
 **unit_cost_with_discount** | [**Currency**](Currency.md) |  | [optional] 
 **upsell** | **BOOLEAN** | True if this item was added to the order as part of an upsell | [optional] 
 **weight** | [**Weight**](Weight.md) |  | [optional] 
 **width** | [**Distance**](Distance.md) |  | [optional]