How can I replace Replit with AWS Lambda as middleware for ServiceNow integration?

[VinitSargam]

Hello Community,

I currently have an integration flow like this:
ElevenLabs → Replit → ServiceNow

Replit is acting as middleware to process data and send it to ServiceNow using REST APIs. I want to replace Replit with AWS Lambda for better scalability and security.

My questions are:

1. What is the best way to connect aws lambda  to ServiceNow REST API ?
2. How should I handle authentication (Basic Auth or OAuth) securely in Lambda?
3. Are there any best practices for exposing Lambda via API Gateway so ElevenLabs can send data?
4. Any sample Node.js code or reference architecture would be very helpful.