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If authentication secrets are provided in app-config.yaml, it will be used. If not, environment variables AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY and AWS_REGION will be used. If not present, ~/.aws/config will be used to read the configs. https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/loading-node-credentials-environment.html https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/loading-node-credentials-shared.html https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/setting-region.html