Track an embedded message received event

This endpoint tracks that a given embedded message was received on a device. It creates an <code>embeddedReceived</code> event in Iterable. <br/><br/>An <code>embeddedReceived</code> event indicates that a device has retrieved a message. It does not mean that the message has been displayed.<br/><br/>Iterable's SDKs automatically call this endpoint for each embedded message they retrieve. If you're not using an SDK, call this endpoint once per embedded message you retrieve from Iterable's API.<br/><br/>For test messages (proofs), no events are created.<br/><br/>Learn about <a href="https://support.iterable.com/hc/articles/29156459027348">identifying users by <code>userId</code> and <code>email</code></a>.