Reduction of amount for siblings implemented

app/Resources/EventResource.php

@@ -74,6 +74,7 @@ class EventResource extends JsonResource{
             $returnArray['nameShort'] = substr($returnArray['nameShort'], 8, 13) . '...';
         }
 
+        $returnArray['siblingReduction'] = $this->event->sibling_reduction ?? true;
         $returnArray['costUnit'] = new CostUnitResource($this->event->costUnit()->first())->toArray(true);
         $returnArray['solidarityPayment'] = $this->event->participation_fee_type === ParticipationFeeType::PARTICIPATION_FEE_TYPE_SOLIDARITY;
         $returnArray['payPerDay'] = $this->event->pay_per_day;
@@ -301,7 +302,8 @@ class EventResource extends JsonResource{
         string $participationType,
         string $feeType,
         DateTime $arrival,
-        DateTime $departure
+        DateTime $departure,
+        bool $hasSibling
     ) : Amount {
         $fee = collect([
             $this->event->participationFee1,
@@ -324,6 +326,10 @@ class EventResource extends JsonResource{
             $basicFee = $basicFee->multiply($days);
         }
 
+        if ($hasSibling && $this->event->sibling_reduction) {
+            $basicFee = $basicFee->multiply(0.5);
+        }
+
         return $basicFee;
     }
 }