I would like to know if there is a way to know through the API when a certain email was sent to a certain user. My use case is this: I am generating a coupon for users when they enter a sequence and I am sharing the coupon with them in the last email of the sequence. I would like to cancel the coupon 48h after I have sent them the email with the coupon. To do that I need to know when an email of a sequence was sent to the user. Is this possible>