Step 1: Create (or Identify) Lambda-backed API in API Gateway

1. Open the API Gateway console.
2. If you haven’t already, create a REST API (or HTTP API) and add a resource/method that integrates with your Lambda function:
   • REST API: Resource → Create Resource → Method (e.g. GET) → Lambda Function integration.
   • HTTP API: Routes → Create → attach an Integration pointing to your Lambda.

Step 2: Generate an API Key

1. In API Gateway’s left nav, choose API Keys, then Create API key.
2. Give it a name (e.g. MyServiceKey) and click Save.
3. On the detail page, note the Value (the actual key string clients must send).

Step 3: Define a Usage Plan

A usage plan ties API stages to throttling/quota and API keys.

Console Steps: