I'm kind of new to the API world in SFMC and just wanted to clear up some confusions that I have.
I wanted to build a transactional type journey for our members and the entry source for this is of course the API Event. We are using the REST API method.
Which of these method is the best practice or is my assumptions below correct?
Insert/Upsert the records into the users table that is the Contact Population? For any changes in the data journey will be via the Data Extension update.
Create a new Contact via the API? Subsequent activity such as updates will then be done via the PATCH call. However the question that I have for this, where is the record going to be inserted? Is it the users table as defined in the contact population?
Thanking you all in advance.