{
  "RequestType": "Create",
  "RequestId": "unique id for this delete request",
  "ResponseURL": "pre-signed-url-for-delete-response",
  "ResourceType": "Custom::MyCustomResourceType",
  "LogicalResourceId": "name of resource in template",
  "StackId": "arn:aws:cloudformation:us-east-2:namespace:stack/stack-name/guid",
  "ResourceProperties": {
    "a": "string",
    "b": ["list"]
  }
}