DRF Serializers for Models with OneToOne relationship

Given Django Models that have a OneToOne relationship, how does one setup the Django Rest Framework Serializers & Views so that to the API consumer the end-point for paying in cash and paying in cheque include the payment model and allow for all CRUD functionality?

I've tried following this SO Question here but I can't seem to replicate the functionality.

Models

class Payment(models.Model):
    """
    Payment Log
    """
    merchant = models.ForeignKey(Entity, on_delete=models.CASCADE, related_name="%(app_label)s_%(class)s_merchant")
    customer = models.ForeignKey(Entity, on_delete=models.CASCADE, related_name="%(app_label)s_%(class)s_customer")
    payment_method = models.ForeignKey(PaymentMethod, on_delete=models.CASCADE)
    trx_amount = models.DecimalField(max_digits=10, decimal_places=3)

class PaymentCash(models.Model):
    """
    Cash payments
    """
    payment = models.OneToOneField(Payment, on_delete=models.CASCADE, primary_key=True)
    date_paid = models.DateField()
    # Other fields

class PaymentCheque(models.Model):
    """
    Cheque deposits
    """
    payment = models.OneToOneField(Payment, on_delete=models.CASCADE, primary_key=True)
    cheque_number = models.CharField(max_length=50)
    # Other fields

Sample View

class PaymentCashViewSet(ListCreateRetrieveUpdateViewSet):
    """
    Cash payment view
    """
    queryset = PaymentCash.objects.all()
    serializer_class = PaymentCashSerializer
    permission_classes = (IsAuthenticated, HasPermission)

Current Serializer This though does not make use of all the fields in the Payment Model.

class PaymentCashSerializer(serializers.ModelSerializer):
    """Serialize model"""
    class Meta:
        model = PaymentCash
        fields = ('payment', 'date_paid')

Using: Django==1.10.2 & djangorestframework==3.5.1