receiver2.py

def lambda_handler(event, context):
    """
    Receives Slack events, performs basic validation, and asynchronously invokes the processor Lambda
    """
    print("Received event: %s", json.dumps(event))
    
    try:
        # Parse the event body
        body = json.loads(event['body'])
        
        # Handle Slack URL verification challenge
        if 'challenge' in body:
            return {
                'statusCode': 200,
                'body': json.dumps({'challenge': body['challenge']})
            }