public function update_order_args() {
		return [
			'order_id' => [
				'description'       => __( 'Order ID in PayPal', 'event-tickets' ),
				'required'          => true,
				'type'              => 'string',
				'validate_callback' => static function ( $value ) {
					if ( ! is_string( $value ) ) {
						return new WP_Error( 'rest_invalid_param', 'The order ID argument must be a string.', [ 'status' => 400 ] );
					}

					return $value;
				},
				'sanitize_callback' => [ $this, 'sanitize_callback' ],
			],
			'payer_id' => [
				'description'       => __( 'Payer ID token from PayPal', 'event-tickets' ),
				'required'          => false,
				'type'              => 'string',
				'validate_callback' => static function ( $value ) {
					if ( ! is_string( $value ) ) {
						return new WP_Error( 'rest_invalid_param', 'The payer ID argument must be a string.', [ 'status' => 400 ] );
					}

					return $value;
				},
				'sanitize_callback' => [ $this, 'sanitize_callback' ],
			],
		];
	}