Add external_id field to trackEvent Action

[tcgilbert]

This update adds the ability to map a Segment field to Klaviyo's external_id in their create event api.

This comes at the request of the Klaviyo team:

The only other request I have Thomas is that in track/identify mappings for Klaviyo Actions, I’d love to have the ability to add “external_id” in as a profile property. This would help on our side of attributing events in the case where if we wanted to map the segment user_id to an external_id on our end, we could track events without a hard email / phone in the payload (like track calls).

Testing

Tested locally:

[joe-ayoub-segment]

Seems like a straightforward change. Just a few questions:

1. Does adding support for external_id break with any conventions in other Actions? e.g. does another Action also support external_id, but maybe have it named or handled differently?

2. Should there be default mappings for the external_id (and maybe also phone_number and email ) field?

3. Has this been end to end tested some how? Has it been confirmed that the external_id gets to Klaviyo correctly?

[tcgilbert]

Does adding support for external_id break with any conventions in other Actions? e.g. does another Action also support external_id, but maybe have it named or handled differently?

No. All the other actions actually have an external_id field, so if anything this makes the actions more congruent.

Should there be default mappings for the external_id (and maybe also phone_number and email ) field?

Can you add default mappings to properties within a object type? If so, I think this would make sense

Has this been end to end tested some how? Has it been confirmed that the external_id gets to Klaviyo correctly?

I've been sending events from Actions tester to Klaviyo, and can verify that the external_id is arriving within klaviyo. If there is any other way to test, happy to do so as well. Here is one for "Order Completed", external_id was empty previsouly

[tcgilbert]

waiting for clarity on payload validation from Klaviyo