Hi, As I understand it, I can send transactional messages by "event" or "profile". When sending by "event", I pass the message information in the body of the API call. In my case that would be the user's email and the message content. What are the cost or cost/1000 emails sent to do this for ~2M messages per month? Is the correct process to:Call the Profile API to determine if the user has an "active profile"; and thenCall the ACS messaging API with either an Event or Profile type transactional ...