We'd like to send a Welcome email to people who sign-up to our online service. Does the CC API offer a way to do that?
I reviewed the API documentation and could not find that option.
Yes, there is absolutely a way to trigger welcome emails when adding a contact to an account (like through a signup form). I've just updated our PHP example here to do so.
You just need to append your request URL when adding a contact to the account with action_by=ACTION_BY_VISITOR if you're using our V2 API. Keep in mind that the Welcome email will only be sent to an email address that has never been in the account before (so test with a new email address each time when testing the welcome email).
Partner API Support Engineer