This is the sample, using NEMLibrary on AWS lambda.

• AWS Lambda runtime: Node.js 8.10
• apex
  • http://apex.run/

• Setting AWS credentials
  • see: http://apex.run/
• Setting following environment variable on functions/SendXem/function.json

"environment": {
 "PRIVATE_KEY": "YOUR_PRIVATE_KEY",
 "TO_ADDRESS": "DESTINATION_ADDRESS"
}

• Deploy with follwing command

% apex deploy

• Run with following command

% echo -n '{}' | apex invoke SendXem