diff --git a/addons/payment_authorize/models/payment.py b/addons/payment_authorize/models/payment.py
index 73c7c044e0a..6c31e7a499e 100644
--- a/addons/payment_authorize/models/payment.py
+++ b/addons/payment_authorize/models/payment.py
@@ -5,6 +5,7 @@ from datetime import datetime
 import hashlib
 import hmac
 import logging
+import string
 import time
 import urlparse
 
@@ -54,7 +55,15 @@ class PaymentAcquirerAuthorize(models.Model):
             values['x_fp_timestamp'],
             values['x_amount'],
             values['x_currency_code']])
-        return hmac.new(str(values['x_trans_key']), data, hashlib.md5).hexdigest()
+
+        # [BACKWARD COMPATIBILITY] Check that the merchant did update his transaction
+        # key to signature key (end of MD5 support from Authorize.net)
+        # The signature key is now '128-character hexadecimal format', while the
+        # transaction key was only 16-character.
+        if len(values['x_trans_key']) == 128:
+            return hmac.new(values['x_trans_key'].decode("hex"), data, hashlib.sha512).hexdigest().upper()
+        else:
+            return hmac.new(str(values['x_trans_key']), data, hashlib.md5).hexdigest()
 
     @api.multi
     def authorize_form_generate_values(self, values):
@@ -172,7 +181,7 @@ class TxAuthorize(models.Model):
     def _authorize_form_get_tx_from_data(self, data):
         """ Given a data dict coming from authorize, verify it and find the related
         transaction record. """
-        reference, trans_id, fingerprint = data.get('x_invoice_num'), data.get('x_trans_id'), data.get('x_MD5_Hash')
+        reference, trans_id, fingerprint = data.get('x_invoice_num'), data.get('x_trans_id'), data.get('x_SHA2_Hash') or data.get('x_MD5_Hash')
         if not reference or not trans_id or not fingerprint:
             error_msg = _('Authorize: received data with missing reference (%s) or trans_id (%s) or fingerprint (%s)') % (reference, trans_id, fingerprint)
             _logger.info(error_msg)
diff --git a/addons/payment_authorize/tests/test_authorize.py b/addons/payment_authorize/tests/test_authorize.py
index 35be8a99b17..2d1d7665ce3 100644
--- a/addons/payment_authorize/tests/test_authorize.py
+++ b/addons/payment_authorize/tests/test_authorize.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 
-import hashlib
-import hmac
 import time
 import urlparse
 import unittest
@@ -32,15 +30,6 @@ class AuthorizeCommon(PaymentAcquirerCommon):
 @odoo.tests.common.post_install(True)
 class AuthorizeForm(AuthorizeCommon):
 
-    def _authorize_generate_hashing(self, values):
-        data = '^'.join([
-            values['x_login'],
-            values['x_fp_sequence'],
-            values['x_fp_timestamp'],
-            values['x_amount'],
-        ]) + '^'
-        return hmac.new(str(values['x_trans_key']), data, hashlib.md5).hexdigest()
-
     def test_10_Authorize_form_render(self):
         self.assertEqual(self.authorize.environment, 'test', 'test without test environment')
 
@@ -84,7 +73,7 @@ class AuthorizeForm(AuthorizeCommon):
             'x_ship_to_state': None,
         }
 
-        form_values['x_fp_hash'] = self._authorize_generate_hashing(form_values)
+        form_values['x_fp_hash'] = self.env['payment.acquirer']._authorize_generate_hashing(form_values)
         # render the button
         res = self.authorize.render('SO004', 320.0, self.currency_usd.id, values=self.buyer_values)
         # check form result
@@ -108,7 +97,9 @@ class AuthorizeForm(AuthorizeCommon):
         # typical data posted by authorize after client has successfully paid
         authorize_post_data = {
             'return_url': u'/shop/payment/validate',
+            # x_MD5_Hash will be empty starting the 28th March 2019
             'x_MD5_Hash': u'7934485E1C105940BE854208D10FAB4F',
+            'x_SHA2_Hash': u'7D3AC844BE8CA3F649AB885A90D22CFE35B850338EC91D1A5ADD819A85FF948A3D777334A18CDE36821DC8F2B42A6E1950C1FF96B52B60F23201483A656195FB',
             'x_account_number': u'XXXX0027',
             'x_address': u'Huge Street 2/543',
             'x_amount': u'320.00',