priceParameterIsMissing example

public function __construct(
        private readonly EntityRepository $taxRepository,
        private readonly NetPriceCalculator $netCalculator,
        private readonly GrossPriceCalculator $grossCalculator
    ) {
    }

    #[Route(path: 'api/_action/calculate-price', name: 'api.action.calculate-price', methods: ['POST'])]     public function calculate(Request $request, Context $context): JsonResponse
    {
        if (!$request->request->has('price')) {
            throw CartException::priceParameterIsMissing();
        }
        if (!$request->request->has('taxId')) {
            throw CartException::taxIdParameterIsMissing();
        }

        $taxId = (string) $request->request->get('taxId');
        $price = (float) $request->request->get('price');
        $quantity = $request->request->getInt('quantity', 1);
        $output = (string) $request->request->get('output', 'gross');
        $preCalculated = $request->request->getBoolean('calculated', true);

        
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