calculateCartVolume example

public function match(RuleScope $scope): bool
    {
        if (!$scope instanceof CartRuleScope) {
            return false;
        }

        if ($this->volume === null) {
            throw new UnsupportedValueException(\gettype($this->volume), self::class);
        }

        return RuleComparison::numeric($this->calculateCartVolume($scope->getCart()), $this->volume, $this->operator);
    }

    public function getConstraints(): array
    {
        return [
            'volume' => RuleConstraints::float(),
            'operator' => RuleConstraints::numericOperators(false),
        ];
    }

    public function getConfig(): RuleConfig
    {