def set_active_payment
      @payment ||= session[:payment_data][:billing_class].constantize.find(session[:payment_data][:billing_id])
    rescue
      render text: I18n.t('lolita_paypal.wrong_request'), status: 400
    end
def set_active_payment
      @payment ||= session[:payment_data][:billing_class].constantize.find(session[:payment_data][:billing_id])
    rescue
      render text: I18n.t('lolita_paypal.wrong_request'), status: 400
    end
returns current payment instance from session