diff --git a/subscribie/api.py b/subscribie/api.py
index c77bc36b8..beb871f47 100644
--- a/subscribie/api.py
+++ b/subscribie/api.py
@@ -265,7 +265,7 @@ def create_plan():
         plan = Plan()
         database.session.add(plan)
         for field in planData:
-            if type(field[1]) == list:
+            if isinstance(field[1], list):
                 for sellingPoint in field[1]:
                     plan.selling_points.append(
                         PlanSellingPoints(point=sellingPoint.point)
diff --git a/subscribie/auth.py b/subscribie/auth.py
index dd214d5b4..301d8fffc 100644
--- a/subscribie/auth.py
+++ b/subscribie/auth.py
@@ -579,7 +579,7 @@ def wrapped_view(**kwargs):
             stripe_connect_url = url_for("admin.stripe_connect")
             flash(
                 Markup(
-                    f"You must <a href='{ stripe_connect_url }'>connect Stripe first.</a>"  # noqa: E501
+                    f"You must <a href='{stripe_connect_url}'>connect Stripe first.</a>"  # noqa: E501
                 )
             )
             log.debug(f'Redirecting user to {url_for("admin.dashboard")}')
diff --git a/subscribie/blueprints/admin/subscriber.py b/subscribie/blueprints/admin/subscriber.py
index 07bb73ab0..8e212782b 100644
--- a/subscribie/blueprints/admin/subscriber.py
+++ b/subscribie/blueprints/admin/subscriber.py
@@ -2,7 +2,7 @@
 from subscribie.auth import login_required
 from subscribie.models import Person
 from flask import render_template
-from subscribie.utils import get_stripe_secret_key, get_stripe_connect_account, get_stripe_connect_account_id
+from subscribie.utils import get_stripe_secret_key, get_stripe_connect_account_id
 import stripe
 import logging
 
@@ -22,10 +22,18 @@ def show_subscriber(subscriber_id):
     # Add hosted_invoice_url attribute to all open invoices
     try:
         for index, open_invoice in enumerate(open_invoices):
-            stripe_invoice = stripe.Invoice.retrieve(id=open_invoice.id, stripe_account=stripe_connect_account_id)
-            setattr(open_invoices[index], 'hosted_invoice_url', stripe_invoice.hosted_invoice_url)
+            stripe_invoice = stripe.Invoice.retrieve(
+                id=open_invoice.id, stripe_account=stripe_connect_account_id
+            )
+            setattr(
+                open_invoices[index],
+                "hosted_invoice_url",
+                stripe_invoice.hosted_invoice_url,
+            )
     except Exception as e:
-        log.error(f"Unable to get/set hosted_invoice_url for invoice: {open_invoice.id}. {e}")
+        log.error(
+            f"Unable to get/set hosted_invoice_url for invoice: {open_invoice.id}. {e}"
+        )
 
     # Try to be helpful to the shop owner by highlighting recent payment
     # payment stripe_decline_code errors (if any).
diff --git a/subscribie/blueprints/iframe/__init__.py b/subscribie/blueprints/iframe/__init__.py
index cb4cb65f2..120e26074 100644
--- a/subscribie/blueprints/iframe/__init__.py
+++ b/subscribie/blueprints/iframe/__init__.py
@@ -12,13 +12,14 @@
 def get_iframe_embed():
     """Set optimised title tags for your pages."""
     log.info("Generating iframe")
-    iframe = """<iframe src={} width="100%" frameborder="0" height="800px" scrolling="auto"
-                allowfullscreen="true"
-                title="Subscription shop">
-        </iframe>
-        """.format(
-        request.host_url + '?iframe_embeded="1"'
+    iframe = (
+        f'<iframe src={request.host_url}?iframe_embeded="1" '
+        'width="100%" frameborder="0" height="800px" scrolling="auto" '
+        'allowfullscreen="true" '
+        'title="Subscription shop">\n'
+        "</iframe>"
     )
+
     try:
         return render_template("show-iframe-embed.html", iframe=iframe)
     except TemplateNotFound:
diff --git a/subscribie/utils.py b/subscribie/utils.py
index f6416ee61..908f3179e 100644
--- a/subscribie/utils.py
+++ b/subscribie/utils.py
@@ -249,15 +249,8 @@ def modify_stripe_account_capability(account_id):
 
 
 def create_stripe_tax_rate():
-    from .models import PaymentProvider
     from subscribie.models import TaxRate
 
-    payment_provider = PaymentProvider.query.first()
-    if payment_provider.stripe_livemode:
-        livemode = True
-    else:
-        livemode = False
-
     # If there's no tax rate for current live mode create and save one:
     # if TaxRate.query.filter_by(stripe_livemode=livemode).first() is None:
     stripe.api_key = get_stripe_secret_key()