A workflow could be triggered from a webhook

Sending Webhooks would allow to integrate with any software outside of WordPress (through Zapier for example). (A Webhook Trigger would also be great). In this Action the admin would select which fields to send (username, email etc.), and of course where to send (URL), maybe the request method (GET/POST).

There are many possible use cases e.g. if a user purchases product X dispatch a POST request to invite them to a private P2 blog. The API response would probably just have to be logged. We couldn't perform an additional action based on the response just yet. Fields: Method: GET, POST.. Authentication (would probably have to be stored in the DB) URL Content-type Query params This would be similar to the Send webhook action idea.

SendGrid is an email marketing tool

Would be useful to have more rules for subscriptions as an example: shipping country can be used to update shipping prices based on country (when using per product shipping).

Add Elementor Form Submission to Trigger. Similar to Mailchimp for Wordpress integration. This can open innumerous possibilities, like popups, contact forms. Plus Elementor Forms allows other integrations like Mailchimp as well.

Customers would also be able to opt-in and out of specific campaigns.

This would be similar to the new communication sign-up page but designed to be used in a popup. So the design would be different and the form would submit via AJAX. By adding this as a shortcode, users can use a third party popup plugin like Boxzilla to handle the frontend popup. Having this sign-up option would provide a good way to capture customer emails and then immediately perform automations like adding a tag to the customer. Benefits: add customer to third-party newsletter list customer email can be used for abandoned cart emails the customer could be sent a unique discount via a workflow