adding instructions for tracking multiple products

Author: joe-ayoub-segment

src/connections/destinations/catalog/actions-snap-conversions/index.md

@@ -70,6 +70,11 @@ If you want to send a Snap Event Type that Segment doesn’t have a prebuilt map
 
 The Snapchat Conversions API only supports sending Event Types that are in the [predefined `event_type` list](https://marketingapi.snapchat.com/docs/conversion.html#conversion-parameters){:target="_blank"}. This includes custom events. You must use `CUSTOM_EVENT_1`, `CUSTOM_EVENT_2`, `CUSTOM_EVENT_3`, `CUSTOM_EVENT_4`, or `CUSTOM_EVENT_5` as the Event Type. Events sent with an invalid event type will fail with an `Unrecognized event type` error.
 
+### Single or multiple products or items
+It's possible to send details of either single or multiple products / items in a single conversion event. 
+Single product / item: Use the 'Item ID', 'Item Category', 'Brand', 'Number of Items' and 'Price' fields. 
+Multiple products / items: Use the 'Products' field which accepts an array of products / items.  
+
 ### Required parameters and hashing
 To match visitor events with Snapchat ads, Snap requires that one or a combination of the following parameters are sent to the Conversions API:
 - Email