parameter-store-dynamic-references

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Example template     
        
Resources:

    GetOrdersFunction:
        Type: AWS::Serverless::Function 
        Properties:
            CodeUri: orderlambda/
            Handler: app.lambdaHandler
            Runtime: nodejs8.10
            Environment: 
                Variables:
                    DB_USER: '{{resolve:ssm:DATABASE_USERNAME:1}}'
                    DB_PASSWORD: '{{resolve:ssm:DATABASE_PASSWORD:1}}'
                    DB_HOSTNAME: '{{resolve:ssm:DATABASE_HOSTNAME:1}}'
            Events:
                HelloWorld:
                    Type: Api
                    Properties:
                        Path: /orders
                        Method: get