Configuring an AWS Alias
You need to configure an AWS alias when you:
Use a custom extension that calls an AWS Lamdba function from within a runtime policy enforcement flow of
API Gateway API.
Publish data to an AWS Lambda function using custom destination.
To configure an AWS alias
1. On the title bar, expand the menu options icon 
and select Administration. 2. Click External accounts > AWS configuration.
3. Click Add new AWS account.
4. In the Add AWS configuration section, provide the following information
a. Name. Provide the AWS alias name.
b. Description. Optional. Provide a description for the alias.
c. Region. Provide the AWS account region where the Lambda function is running or deployed.
d. Access key ID. Provide the access key ID of the AWS account where the Lambda function is running.
e. Secret access key. Provide the secret access key of the AWS account where the Lambda function is running.
5. Click Add.
This creates the AWS alias and lists in the AWS configuration page.