export default {
  apiKey: '', // Set your Engine API key here
  logging: {
    level: 'DEBUG' // Engine Proxy logging level. DEBUG, INFO, WARN or ERROR
  }
};

export default {
  apiKey: process.env.ENGINE_API_KEY, // Set your Apollo Engine API key
  logging: {
    level: 'DEBUG' // Engine Proxy logging level. DEBUG, INFO, WARN or ERROR
  }
};

Use the env API key as suggested by Apollo Engine documentation