Can I send multiple properties with the Send Mailchimp Event action?
The Send Mailchimp Event invocable action currently supports one property per event, entered as a single Property Name and Property Value pair in Flow. There is no option to add a second pair, so if you only see one Name/Value row in the action, that is expected.
If you need more than one piece of context on an event, there are two workarounds:
1. Call the action more than once:
Add the Send Mailchimp Event action multiple times in your Flow with the same record, audience and event name, but a different property pair each time. Note: this creates separate events in Mailchimp rather than one event with several properties, so it suits journey triggers and segmentation but not the |EVENT:PROPERTY| merge tag.
2. Pack the values into one property:
Build a single value with a Flow formula, for example a property named "details" containing a delimited or JSON-style string. This keeps everything on one event, though Mailchimp treats it as one property.
Note: the Mailchimp Events API itself accepts multiple properties per event; this is a current limit of our action. We have an enhancement under review to support multiple property pairs.
