The type is `bool`.

The type is 'double'.

The type is `int64`.

The type is `string`.

The type is unspecified, and will result in an error.

`Authentication` defines the authentication configuration for an API.

Authentication rules for the service.

Configuration for an anthentication provider, including support for [JSON Web Token (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).

User-defined authentication requirements, including support for [JSON Web Token (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).

`Backend` defines the backend configuration for a service.

A backend rule provides configuration for an individual API element.

Billing related configuration of the service.

Configuration of a specific billing destination (Currently only support bill against consumer project).

`Context` defines which contexts an API requests.

A context rule provides information about the context for an individual API element.

Selects and configures the service controller used by the service.

`Documentation` provides the information for describing a service.

A documentation rule provides information about individual API elements.

`Endpoint` describes a network endpoint that serves a set of APIs.

A description of a log type.

Logging configuration of the service.

Configuration of a specific logging destination (the producer project or the consumer project).

Bind API methods to metrics.

Monitoring configuration of the service.

Configuration of a specific monitoring destination (the producer project or the consumer project).

OAuth scopes are a way to define data and permissions on data.

Represents a documentation page.

A descriptor for defining project properties for a service.

Defines project properties.

Quota configuration helps to achieve fairness and budgeting in service usage.

`QuotaLimit` defines a specific limit that applies over a specified duration for a limit type.

`Service` is the root object of Google service configuration schema.

Source information used to create a Service Config.

Define a parameter's name and location.

Define a system parameter rule mapping system parameter definitions to methods.

### System parameter configuration A system parameter is a special kind of parameter defined by the API system, not by an individual API.

Configuration controlling usage of a service.

Usage configuration rules for the service.

Supported data type of the property values.