zapier trigger
Add a new Zapier Action: "Trigger Journey" (similar to the API's Trigger Journey call)
Currently, you can add a contact to a list via Zapier and use the List Trigger however for recurring events (Ex: eCommerce purchases) the contact must be removed from the list prior to the Zap coming in or else they will not be re-triggered in the journey.
A Zapier Trigger Journey action would allow for contacts to be triggered into the same journey by consecutive zaps without an odd operational task of removing the contact from a list.
This also advertises the zapier integration directly from the canvas (heck it's already a round logo like triggers!)