Em MyFirstFunction, abra a aba Code e o editor Code source para lambda_function.py.
Substitua o arquivo inteiro por:

import json
import os

STAGE = os.getenv("STAGE", "dev")

def lambda_handler(event, context):
    request_id = context.aws_request_id
    print("REQUEST_ID:", request_id)
    print("EVENT:", json.dumps(event))

    name = event.get("name")
    if not name:
        return {
            "statusCode": 400,
            "body": json.dumps({
                "stage": STAGE,
                "request_id": request_id,
                "error": "Missing required field: name"
            })
        }

    return {
        "statusCode": 200,
        "body": json.dumps({
            "stage": STAGE,
            "request_id": request_id,
            "message": f"Hello, {name}!"
        })
    }

Clique em Deploy.

Configurando funções Lambda

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