Parser and handler for incoming Instant payment notifications from paypal. The Example shows a typical handler in a rails application. Note that this is an example, please read the Paypal API documentation for all the details on creating a safe payment controller.
Example
class BackendController < ApplicationController include ActiveMerchant::Billing::Integrations def paypal_ipn notify = Paypal::Notification.new(request.raw_post) order = Order.find(notify.item_id) if notify.acknowledge begin if notify.complete? and order.total == notify.amount order.status = 'success' shop.ship(order) else logger.error("Failed to verify Paypal's notification, please investigate") end rescue => e order.status = 'failed' raise ensure order.save end end render :nothing end end
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 120 def account params['business'] || params['receiver_email'] end
Acknowledge the transaction to paypal. This method has to be called after a new ipn arrives. Paypal will verify that all the information we received are correct and will return a ok or a fail.
Example:
def paypal_ipn notify = PaypalNotification.new(request.raw_post) if notify.acknowledge ... process order ... if notify.complete? else ... log possible hacking attempt ... end
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 138 def acknowledge payload = raw response = ssl_post(Paypal.service_url + '?cmd=_notify-validate', payload, 'Content-Length' => "#{payload.size}", 'User-Agent' => "Active Merchant -- http://activemerchant.org" ) raise StandardError.new("Faulty paypal result: #{response}") unless ["VERIFIED", "INVALID"].include?(response) response == "VERIFIED" end
Was the transaction complete?
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 48 def complete? status == "Completed" end
What currency have we been dealing with
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 99 def currency params['mc_currency'] end
the markup paypal charges for the transaction
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 94 def fee params['mc_fee'] end
the money amount we received in X.2 decimal.
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 89 def gross params['mc_gross'] end
This is the invoice which you passed to paypal
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 111 def invoice params['invoice'] end
This is the item number which we submitted to paypal The custom field is also mapped to item_id because PayPal doesn’t return item_number in dispute notifications
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 106 def item_id params['item_number'] || params['custom'] end
When was this payment received by the client. sometimes it can happen that we get the notification much later. One possible scenario is that our web application was down. In this case paypal tries several times an hour to inform us about the notification
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 56 def received_at Time.parse params['payment_date'] end
Status of transaction. List of possible values:
Canceled-Reversal |
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Completed |
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Denied |
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Expired |
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Failed |
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In-Progress |
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Partially-Refunded |
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Pending |
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Processed |
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Refunded |
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Reversed |
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Voided |
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 73 def status params['payment_status'] end
Was this a test transaction?
# File lib/active_merchant/billing/integrations/paypal/notification.rb, line 116 def test? params['test_ipn'] == '1' end
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