protected function get_item_schema_base() {

		return array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => 'api_key',
			'type'       => 'object',
			'properties' => array(
				'description'   => array(
					'description' => __( 'Friendly, human-readable name or description.', 'lifterlms' ),
					'type'        => 'string',
					'required'    => true,
					'context'     => array( 'view', 'edit' ),
					'arg_options' => array(
						'sanitize_callback' => 'sanitize_text_field',
					),
				),
				'permissions'   => array(
					'description' => __( 'Determines the capabilities and permissions of the key.', 'lifterlms' ),
					'type'        => 'string',
					'required'    => true,
					'context'     => array( 'view', 'edit' ),
					'enum'        => array_keys( LLMS_REST_API()->keys()->get_permissions() ),
				),
				'user_id'       => array(
					'description' => __( 'The WordPress User ID of the key owner.', 'lifterlms' ),
					'type'        => 'integer',
					'required'    => true,
					'context'     => array( 'view', 'edit' ),
					'arg_options' => array(
						'sanitize_callback' => 'absint',
						'validate_callback' => array( $this, 'validate_user_exists' ),
					),
				),
				'truncated_key' => array(
					'description' => __( 'The last 7 characters of the Consumer Key.', 'lifterlms' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'last_access'   => array(
					'description' => __( 'The date the key was last used. Format: Y-m-d H:i:s.', 'lifterlms' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
			),
		);

	}