I’m aware that you can send the amp_user_id field to SendGrid, to identify a user that’s engaging w/ an email with an ID other than the email, but I want to send other event properties through the SendGrid event that gets sent to Amplitude via the integration.
I can’t seem to find any documentation on Amplitude or SendGrid that mentions if you can add on custom event properties in addition to the ones that are generated by SendGrid automatically.
Can you just send it via the `custom_args` listed in the SendGrid docs here https://docs.sendgrid.com/for-developers/tracking-events/event#event-objects and Amplitude will recognize it?