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diff --git a/addons/payment_paypal/controllers/main.py b/addons/payment_paypal/controllers/main.py
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+++ b/addons/payment_paypal/controllers/main.py
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+# -*- coding: utf-8 -*-
+
+import json
+import logging
+import pprint
+
+import requests
+import werkzeug
+from werkzeug import urls
+
+from odoo import http
+from odoo.addons.payment.models.payment_acquirer import ValidationError
+from odoo.http import request
+
+_logger = logging.getLogger(__name__)
+
+
+class PaypalController(http.Controller):
+    _notify_url = '/payment/paypal/ipn/'
+    _return_url = '/payment/paypal/dpn/'
+    _cancel_url = '/payment/paypal/cancel/'
+
+    def _parse_pdt_response(self, response):
+        """ Parse a text response for a PDT verification.
+
+            :param str response: text response, structured in the following way:
+                STATUS\nkey1=value1\nkey2=value2...\n
+             or STATUS\nError message...\n
+            :rtype tuple(str, dict)
+            :return: tuple containing the STATUS str and the key/value pairs
+                     parsed as a dict
+        """
+        lines = [line for line in response.split('\n') if line]
+        status = lines.pop(0)
+
+        pdt_post = {}
+        for line in lines:
+            split = line.split('=', 1)
+            if len(split) == 2:
+                pdt_post[split[0]] = urls.url_unquote_plus(split[1])
+            else:
+                _logger.warning('Paypal: error processing pdt response: %s', line)
+
+        return status, pdt_post
+
+    def paypal_validate_data(self, **post):
+        """ Paypal IPN: three steps validation to ensure data correctness
+
+         - step 1: return an empty HTTP 200 response -> will be done at the end
+           by returning ''
+         - step 2: POST the complete, unaltered message back to Paypal (preceded
+           by cmd=_notify-validate or _notify-synch for PDT), with same encoding
+         - step 3: paypal send either VERIFIED or INVALID (single word) for IPN
+                   or SUCCESS or FAIL (+ data) for PDT
+
+        Once data is validated, process it. """
+        res = False
+        post['cmd'] = '_notify-validate'
+        reference = post.get('item_number')
+        tx = None
+        if reference:
+            tx = request.env['payment.transaction'].sudo().search([('reference', '=', reference)])
+        if not tx:
+            # we have seemingly received a notification for a payment that did not come from
+            # odoo, acknowledge it otherwise paypal will keep trying
+            _logger.warning('received notification for unknown payment reference')
+            return False
+        paypal_url = tx.acquirer_id.paypal_get_form_action_url()
+        pdt_request = bool(post.get('amt'))  # check for specific pdt param
+        if pdt_request:
+            # this means we are in PDT instead of DPN like before
+            # fetch the PDT token
+            post['at'] = tx and tx.acquirer_id.paypal_pdt_token or ''
+            post['cmd'] = '_notify-synch'  # command is different in PDT than IPN/DPN
+        urequest = requests.post(paypal_url, post)
+        urequest.raise_for_status()
+        resp = urequest.text
+        if pdt_request:
+            resp, post = self._parse_pdt_response(resp)
+        if resp in ['VERIFIED', 'SUCCESS']:
+            _logger.info('Paypal: validated data')
+            res = request.env['payment.transaction'].sudo().form_feedback(post, 'paypal')
+            if not res and tx:
+                tx._set_transaction_error('Validation error occured. Please contact your administrator.')
+        elif resp in ['INVALID', 'FAIL']:
+            _logger.warning('Paypal: answered INVALID/FAIL on data verification')
+            if tx:
+                tx._set_transaction_error('Invalid response from Paypal. Please contact your administrator.')
+        else:
+            _logger.warning('Paypal: unrecognized paypal answer, received %s instead of VERIFIED/SUCCESS or INVALID/FAIL (validation: %s)' % (resp, 'PDT' if pdt_request else 'IPN/DPN'))
+            if tx:
+                tx._set_transaction_error('Unrecognized error from Paypal. Please contact your administrator.')
+        return res
+
+    @http.route('/payment/paypal/ipn/', type='http', auth='public', methods=['POST'], csrf=False)
+    def paypal_ipn(self, **post):
+        """ Paypal IPN. """
+        _logger.info('Beginning Paypal IPN form_feedback with post data %s', pprint.pformat(post))  # debug
+        try:
+            self.paypal_validate_data(**post)
+        except ValidationError:
+            _logger.exception('Unable to validate the Paypal payment')
+        return ''
+
+    @http.route('/payment/paypal/dpn', type='http', auth="public", methods=['POST', 'GET'], csrf=False)
+    def paypal_dpn(self, **post):
+        """ Paypal DPN """
+        _logger.info('Beginning Paypal DPN form_feedback with post data %s', pprint.pformat(post))  # debug
+        try:
+            res = self.paypal_validate_data(**post)
+        except ValidationError:
+            _logger.exception('Unable to validate the Paypal payment')
+        return werkzeug.utils.redirect('/payment/process')
+
+    @http.route('/payment/paypal/cancel', type='http', auth="public", csrf=False)
+    def paypal_cancel(self, **post):
+        """ When the user cancels its Paypal payment: GET on this route """
+        _logger.info('Beginning Paypal cancel with post data %s', pprint.pformat(post))  # debug
+        return werkzeug.utils.redirect('/payment/process')