public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
		$key                       = 'get_item';
		$args                      = WP_REST_Controller::get_endpoint_args_for_item_schema( $method );
		$args['id']['description'] = __( 'ID of the Messages Thread.', 'buddypress' );

		if ( WP_REST_Server::CREATABLE === $method ) {
			$key = 'create_item';

			// Edit the Thread ID description and default properties.
			$args['id']['description'] = __( 'ID of the Messages Thread. Required when replying to an existing Thread.', 'buddypress' );
			$args['id']['default']     = 0;

			// Add the sender_id argument.
			$args['sender_id'] = array(
				'description'       => __( 'The user ID of the Message sender.', 'buddypress' ),
				'required'          => false,
				'default'           => bp_loggedin_user_id(),
				'type'              => 'integer',
				'sanitize_callback' => 'absint',
				'validate_callback' => 'rest_validate_request_arg',
			);

			// Edit subject's properties.
			$args['subject']['type']        = 'string';
			$args['subject']['default']     = false;
			$args['subject']['description'] = __( 'Subject of the Message initializing the Thread.', 'buddypress' );

			// Edit message's properties.
			$args['message']['type']        = 'string';
			$args['message']['description'] = __( 'Content of the Message to add to the Thread.', 'buddypress' );

			// Edit recipients properties.
			$args['recipients']['items']             = array( 'type' => 'integer' );
			$args['recipients']['sanitize_callback'] = 'wp_parse_id_list';
			$args['recipients']['validate_callback'] = 'rest_validate_request_arg';
			$args['recipients']['description']       = __( 'The list of the recipients user IDs of the Message.', 'buddypress' );

			// Remove unused properties for this transport method.
			unset( $args['subject']['properties'], $args['message']['properties'] );

		} else {
			unset( $args['sender_id'], $args['subject'], $args['message'], $args['recipients'] );

			if ( WP_REST_Server::EDITABLE === $method ) {
				$key = 'update_item';

				$args['message_id'] = array(
					'description'       => __( 'By default the latest message of the thread will be updated. Specify this message ID to edit another message of the thread.', 'buddypress' ),
					'required'          => false,
					'type'              => 'integer',
					'sanitize_callback' => 'absint',
					'validate_callback' => 'rest_validate_request_arg',
				);
			}

			if ( WP_REST_Server::DELETABLE === $method ) {
				$key = 'delete_item';

				$args['user_id'] = array(
					'description'       => __( 'The user ID to remove from the thread', 'buddypress' ),
					'required'          => true,
					'type'              => 'integer',
					'sanitize_callback' => 'absint',
					'validate_callback' => 'rest_validate_request_arg',
					'default'           => bp_loggedin_user_id(),
				);
			}
		}

		/**
		 * Filters the method query arguments.
		 *
		 * @since 5.0.0
		 *
		 * @param array $args Query arguments.
		 * @param string $method HTTP method of the request.
		 */
		return apply_filters( "bp_rest_messages_{$key}_query_arguments", $args, $method );
	}