erp5_stripe: Use activity to store stripe session in ERP5

We set the module as a source to acquire roles. Also, we need to store request and response in HTTP Exchange.

This merge request is to fix nexedi/erp5@ec4a3f9d

See merge request nexedi/erp5!1771

bt5/erp5_stripe/SkinTemplateItem/portal_skins/erp5_stripe/StripePaymentSessionModule_storeStripeSession.py

@@ -6,15 +6,15 @@ stripe_payment_session = portal.stripe_payment_session_module.newContent(
   expiration_date=expiration_date,
   resource=resource,
   source_value=portal.restrictedTraverse(source),
-  causality=causality
-)
+  causality=causality)
 
 http_exchange = portal.system_event_module.newContent(
   portal_type="HTTP Exchange",
   title="Create Session",
+  source_value=context,
   follow_up_value=stripe_payment_session,
   resource_value=portal.portal_categories.http_exchange_resource.stripe.create_session,
-)
+  request=request, response=response)
 
 http_exchange.confirm()
 http_exchange.acknowledge()

bt5/erp5_stripe/TestTemplateItem/portal_components/test.erp5.testStripe.py

@@ -598,6 +598,14 @@ class TestStripePaymentSession(ERP5TypeTestCase):
       stripe_payment_session = self.portal.portal_catalog.getResultValue(
         portal_type="Stripe Payment Session",
         reference=session_id)
+      http_exchange, = stripe_payment_session.getFollowUpRelatedValueList(portal_type="HTTP Exchange")
+      self.assertIn("line_items", json.loads(http_exchange.getRequest()))
+      self.assertEqual({
+        'status': 'open',
+        'url': 'https://stripe.url', 
+        'object': 'checkout.session', 
+        'id': 'abc321'
+        }, json.loads(http_exchange.getResponse()))
       self._document_to_delete_list.append(stripe_payment_session)
 
     with responses.RequestsMock() as rsps: