Yes, this is helpful. Thank you.

So to give you a idea of the actions, it has actions from our end and customer action (for marketing): Email / SMS / etc communication from our end Email open/sms clicked by customer

Transaction data actions: Bought x on date and time, bought y on date and time, etc.

All of it is arranged as per the timestamp of that action.

.fit() part I'm passing the data in same manner as you mentioned but not sure why the error is still there. Will check the tutorial someone else has posted!