I am trying to build a Voice assistant skill using alexa.

The alexa skill kit section also has a code section (I went for Custom Skill). Where should I keep my code, in Code section or the AWS LAMBDA, as I also want to send the Captured Voice to a personnel API URL and then get back the text generated by the api as a Voice on the alexa end?

I wrote a basic INTENT called VoiceIntent to just get the text generated from voice and consume it through my API using the event.