Extract stripe plan from invoice and set it to MHB

If the plan does not exist, it implies that it was created in the
dashboard. So, we create it in the backend also.

hosting/models.py

@@ -342,6 +342,27 @@ class MonthlyHostingBill(AssignPermissionsMixin, models.Model):
         if 'line_items' in args:
             line_items = args['line_items']
             for item in line_items:
+                stripe_plan = None
+                if item.type == "subscription" or item.type == "invoiceitem":
+                    # Check stripe plan and prepare it for linking to bill item
+                    stripe_plan_id = item.plan.id
+                    try:
+                        stripe_plan = StripePlan.objects.get(
+                            stripe_plan_name=stripe_plan_id
+                        )
+                    except StripePlan.DoesNotExist as dne:
+                        logger.error(
+                            "StripePlan %s doesn't exist" % stripe_plan_id
+                        )
+                        if stripe_plan_id is not None:
+                            # Create Stripe Plan because we don't have it
+                            stripe_plan = StripePlan.objects.create(
+                                stripe_plan_id=stripe_plan_id,
+                                stripe_plan_name=item.plan.name,
+                                amount=item.plan.amount,
+                                interval=item.plan.interval
+                            )
+                            logger.debug("Creatd StripePlan " + stripe_plan_id)
                 line_item_instance = HostingBillLineItem.objects.create(
                     monthly_hosting_bill=instance,
                     amount=item.amount,
@@ -358,7 +379,8 @@ class MonthlyHostingBill(AssignPermissionsMixin, models.Model):
                     # https://stripe.com/docs/api/invoiceitems/object#invoiceitem_object-unit_amount
                     # So, for the time being I set the unit_amount to 0 if not
                     # found in the line item
-                    unit_amount=item.unit_amount if hasattr(item, "unit_amount") else 0
+                    unit_amount=item.unit_amount if hasattr(item, "unit_amount") else 0,
+                    stripe_plan=stripe_plan
                 )
                 line_item_instance.assign_permissions(instance.customer.user)
         instance.assign_permissions(instance.customer.user)