Principal

Users/Service accounts which have access for DNS binding on the intranet VPC corresponding to the consumer project.

JSON representation 
{

  // Union field principal can be only one of the following:
  "user": string,
  "serviceAccount": string
  // End of list of possible types for union field principal.
}
Fields
Union field principal. The consumer provided user/service account which needs to be granted permission to DNS bind with the intranet VPC corresponding to the consumer project. principal can be only one of the following:
user

string

The user who needs to be granted permission.
serviceAccount

string

The service account which needs to be granted the permission.