Send transactional email

The email address of the recipient.

The ID of the transactional email to send.

If true, a contact will be created in your audience using the email value (if a matching contact doesn’t already exist).

An object containing data as defined by the data variables added to the transactional email template. Values can be of type string or number.

Optionally send an idempotency key to avoid duplicate requests.
The value should be a string of up to 100 characters and should be unique for each request. We recommend using V4 UUIDs or some other method with enough guaranteed entropy to avoid collisions during a 24 hour window.
The endpoint will return a 409 Conflict response if the idempotency key has been used in the previous 24 hours.