INSTALLED_APPS = (
	# ...
	"djangovirtualpos",
)

def payment_summary(request, payment_id):
	"""
	Load a Payment object and show a summary of its contents to the user.
	"""

	payment = get_object_or_404(Payment, id=payment_id, status="pending")
	replacements = {
		"payment": payment,
		# ...
	}
	return render(request, '<sale summary template path>', replacements)

@csrf_exempt
def payment_confirmation(request, virtualpos_type):
	"""
	This view will be called by the bank.
	"""
	# Directly call to confirm_payment view

	# Or implement the following actions

	# Checking if the Point of Sale exists
	virtual_pos = VirtualPointOfSale.receiveConfirmation(request, virtualpos_type=virtualpos_type)

	if not virtual_pos:
		# The VPOS does not exist, inform the bank with a cancel
		# response if needed
		return VirtualPointOfSale.staticResponseNok(virtualpos_type)

	# Verify if bank confirmation is indeed from the bank
	verified = virtual_pos.verifyConfirmation()
	operation_number = virtual_pos.operation.operation_number

	with transaction.atomic():
		try:
			# Getting your payment object from operation number
			payment = Payment.objects.get(operation_number=operation_number, status="pending")
		except Payment.DoesNotExist:
			return virtual_pos.responseNok("not_exists")

		if verified:
			# Charge the money and answer the bank confirmation
			try:
				response = virtual_pos.charge()
				# Implement the online_confirm method in your payment
				# this method will mark this payment as paid and will
				# store the payment date and time.
				payment.online_confirm()
			except VPOSCantCharge as e:
				return virtual_pos.responseNok(extended_status=e)
			except Exception as e:
				return virtual_pos.responseNok("cant_charge")

		else:
			# Payment could not be verified
			# signature is not right
			response = virtual_pos.responseNok("verification_error")

		return response

def payment_ok(request, sale_code):
	"""
	Informs the user that the payment has been made successfully
	:param payment_code: Payment code.
	:param request: request.
	"""

	# Load your Payment model given its code
	payment =  get_object_or_404(Payment, code=sale_code, status="paid")

	context = {'pay_status': "Done", "request": request}
	return render(request, '<payment_ok template>', {'context': context, 'payment': payment})

def payment_cancel(request, sale_code):
	"""
	Informs the user that the payment has been canceled
	:param payment_code: Payment code.
	:param request: request.
	"""

	# Load your Payment model given its code
	payment =  get_object_or_404(Payment, code=sale_code, status="pending")
	# Mark this payment as canceled
	payment.cancel()

	context = {'pay_status': "Done", "request": request}
	return render(request, '<payment_canceled template>', {'context': context, 'payment': payment})

def refund(request, tpv, payment_code, amount, description):
	"""
	:param request:
	:param tpv: TPV Id
	:param payment_code: Payment code
	:param amount: Refund Amount (Example 10.89).
	:param description: Description of refund cause.
	:return:
	"""
	
	amount = Decimal(amount)
	
	try:
		# Checking if the Point of Sale exists
		tpv = VirtualPointOfSale.get(id=tpv)
		# Checking if the Payment exists
		payment = Payment.objects.get(code=payment_code, state="paid")
		
	except Payment.DoesNotExist as e:
		return http_bad_request_response_json_error(message=u"Does not exist payment with code {0}".format(payment_code))
	
	refund_status = tpv.refund(payment_code, amount, description)
	
	if refund_status:
		message = u"Refund successful"
	else:
		message = u"Refund with erros"

	return http_response_json_ok(message)