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// Type-Safe Full-Stack API Contract: Python Django REST -> Next.js Client
from rest_framework import serializers, viewsets, permissions
from .models import FinancialTransaction

class FinancialTransactionSerializer(serializers.ModelSerializer):
    class Meta:
        model = FinancialTransaction
        fields = ['id', 'reference_code', 'amount', 'currency', 'status', 'created_at']
        read_only_fields = ['id', 'status', 'created_at']

class TransactionViewSet(viewsets.ModelViewSet):
    permission_classes = [permissions.IsAuthenticated]
    serializer_class = FinancialTransactionSerializer

    def get_queryset(self):
        # Strict multi-tenant customer isolation
        return FinancialTransaction.objects.filter(tenant=self.request.user.tenant)