def register_to_payment(order_class, **kwargs):
    """
    A function for registering unaware order class to ``getpaid``. This will
    generate a ``Payment`` model class that will store payments with
    ForeignKey to original order class

    This also will build a model class for every enabled backend.
    """
    global Payment
    global Order

    class Payment(PaymentFactory.construct(order=order_class, **kwargs)):
        objects = PaymentManager()

        class Meta:
            ordering = ('-created_on',)
            verbose_name = _("Payment")
            verbose_name_plural = _("Payments")

    Order = order_class

    # Now build models for backends

    backend_models_modules = import_backend_modules('models')
    for backend_name, models_module in backend_models_modules.items():
        for model in models_module.build_models(Payment):
            apps.register_model(backend_name, model)
    return Payment
A function for registering unaware order class to ``getpaid``. This will
    generate a ``Payment`` model class that will store payments with
    ForeignKey to original order class

    This also will build a model class for every enabled backend.