diff --git a/backend/bot/app/web/admin_api_impl/tariffs.py b/backend/bot/app/web/admin_api_impl/tariffs.py
index f3238aa..965a4e3 100644
--- a/backend/bot/app/web/admin_api_impl/tariffs.py
+++ b/backend/bot/app/web/admin_api_impl/tariffs.py
@@ -25,7 +25,10 @@ async def admin_tariffs_get_route(request: web.Request) -> web.Response:
                     "topup_packages_default": {"rub": [], "stars": []},
                     "tariffs": [],
                 },
-                "provider_currency_support": _provider_currency_support_payload(settings, request.app),
+                "provider_currency_support": _provider_currency_support_payload(
+                    settings,
+                    request.app,
+                ),
             }
         )
 
@@ -71,7 +74,10 @@ async def admin_tariffs_save_route(request: web.Request) -> web.Response:
     )
 
 
-def _provider_currency_support_payload(settings: Settings, app: web.Application) -> List[Dict[str, Any]]:
+def _provider_currency_support_payload(
+    settings: Settings,
+    app: web.Application,
+) -> List[Dict[str, Any]]:
     from bot.payment_providers import iter_provider_specs, resolve_provider_presentation
 
     default_currency = default_payment_currency_code_for_settings(settings)
diff --git a/backend/bot/handlers/admin/user_management.py b/backend/bot/handlers/admin/user_management.py
index 976c1d8..694fce6 100644
--- a/backend/bot/handlers/admin/user_management.py
+++ b/backend/bot/handlers/admin/user_management.py
@@ -453,8 +453,9 @@ async def format_user_card(
 
             # Total revenue from referrals
             referral_revenue = await payment_dal.get_referral_revenue(session, user.user_id)
+            referral_revenue_text = hcode(f"{referral_revenue:.2f} {currency}")
             card_parts.append(
-                f"{_('admin_user_referral_revenue_label')} {hcode(f'{referral_revenue:.2f} {currency}')}"
+                f"{_('admin_user_referral_revenue_label')} {referral_revenue_text}"
             )
         except Exception as e_fin:
             logging.error(
diff --git a/backend/bot/payment_providers/cryptopay.py b/backend/bot/payment_providers/cryptopay.py
index 3da8c23..94457f5 100644
--- a/backend/bot/payment_providers/cryptopay.py
+++ b/backend/bot/payment_providers/cryptopay.py
@@ -640,6 +640,9 @@ SPEC = PaymentProviderSpec(
     presentation_class=CryptoPayPresentation,
     manifest_fields=_CONFIG_MANIFEST + _PRESENTATION_MANIFEST,
     supported_currencies_resolver=_cryptopay_supported_currencies,
-    currency_support_note="Crypto Pay supports different sets for fiat invoices and crypto invoices; CURRENCY_TYPE selects which set is active.",
+    currency_support_note=(
+        "Crypto Pay supports different sets for fiat invoices and crypto invoices; "
+        "CURRENCY_TYPE selects which set is active."
+    ),
     currency_support_url="https://help.crypt.bot/crypto-pay-api/",
 )
diff --git a/backend/bot/payment_providers/freekassa.py b/backend/bot/payment_providers/freekassa.py
index f5163a2..03341d6 100644
--- a/backend/bot/payment_providers/freekassa.py
+++ b/backend/bot/payment_providers/freekassa.py
@@ -776,6 +776,9 @@ SPEC = PaymentProviderSpec(
     presentation_class=FreeKassaPresentation,
     manifest_fields=_CONFIG_MANIFEST + _PRESENTATION_MANIFEST,
     supported_currencies=FREEKASSA_SUPPORTED_CURRENCIES,
-    currency_support_note="FreeKassa SCI documents the payment currency parameter as RUB, USD, EUR, UAH or KZT.",
+    currency_support_note=(
+        "FreeKassa SCI documents the payment currency parameter as "
+        "RUB, USD, EUR, UAH or KZT."
+    ),
     currency_support_url="https://docs.freekassa.net/",
 )
diff --git a/backend/bot/payment_providers/heleket.py b/backend/bot/payment_providers/heleket.py
index 36c009e..5faa786 100644
--- a/backend/bot/payment_providers/heleket.py
+++ b/backend/bot/payment_providers/heleket.py
@@ -894,6 +894,9 @@ SPEC = PaymentProviderSpec(
     supported_currencies_resolver=lambda config: getattr(
         config, "SUPPORTED_CURRENCIES", HELEKET_DEFAULT_SUPPORTED_CURRENCIES
     ),
-    currency_support_note="Heleket supports crypto and fiat invoice currencies, but exact availability can depend on service/account settings.",
+    currency_support_note=(
+        "Heleket supports crypto and fiat invoice currencies, but exact availability "
+        "can depend on service/account settings."
+    ),
     currency_support_url="https://doc.heleket.com/methods/payments/creating-invoice",
 )
diff --git a/backend/bot/payment_providers/platega.py b/backend/bot/payment_providers/platega.py
index 4c6d583..9fb8ab6 100644
--- a/backend/bot/payment_providers/platega.py
+++ b/backend/bot/payment_providers/platega.py
@@ -823,7 +823,10 @@ SBP_SPEC = PaymentProviderSpec(
     manifest_fields=_CONFIG_MANIFEST
     + _platega_presentation_manifest("Platega", "CreditCard", "PLATEGA_SBP"),
     supported_currencies_resolver=lambda config: getattr(config, "SUPPORTED_CURRENCIES", "RUB"),
-    currency_support_note="Platega currencies are merchant/method-specific; configure the codes enabled for your account.",
+    currency_support_note=(
+        "Platega currencies are merchant/method-specific; configure the codes "
+        "enabled for your account."
+    ),
     currency_support_url="https://docs.platega.io/",
 )
 
@@ -851,7 +854,10 @@ CRYPTO_SPEC = PaymentProviderSpec(
     presentation_class=PlategaCryptoPresentation,
     manifest_fields=_platega_presentation_manifest("Platega", "Bitcoin", "PLATEGA_CRYPTO"),
     supported_currencies_resolver=lambda config: getattr(config, "SUPPORTED_CURRENCIES", "RUB"),
-    currency_support_note="Platega currencies are merchant/method-specific; configure the codes enabled for your account.",
+    currency_support_note=(
+        "Platega currencies are merchant/method-specific; configure the codes "
+        "enabled for your account."
+    ),
     currency_support_url="https://docs.platega.io/",
 )
 
diff --git a/backend/bot/payment_providers/severpay.py b/backend/bot/payment_providers/severpay.py
index fcfed99..dfb6071 100644
--- a/backend/bot/payment_providers/severpay.py
+++ b/backend/bot/payment_providers/severpay.py
@@ -681,6 +681,9 @@ SPEC = PaymentProviderSpec(
     presentation_class=SeverPayPresentation,
     manifest_fields=_CONFIG_MANIFEST + _PRESENTATION_MANIFEST,
     supported_currencies_resolver=lambda config: getattr(config, "SUPPORTED_CURRENCIES", "RUB,USD"),
-    currency_support_note="SeverPay PayIn requires a currency; keep this list aligned with your merchant account.",
+    currency_support_note=(
+        "SeverPay PayIn requires a currency; keep this list aligned with your "
+        "merchant account."
+    ),
     currency_support_url="https://docs.severpay.io/ru/payin/create",
 )
diff --git a/backend/bot/payment_providers/wata.py b/backend/bot/payment_providers/wata.py
index d4734a2..b3d1eff 100644
--- a/backend/bot/payment_providers/wata.py
+++ b/backend/bot/payment_providers/wata.py
@@ -1207,6 +1207,9 @@ SPEC = PaymentProviderSpec(
     presentation_class=WataPresentation,
     manifest_fields=_CONFIG_MANIFEST + _PRESENTATION_MANIFEST,
     supported_currencies=WATA_SUPPORTED_CURRENCIES,
-    currency_support_note="WATA H2H payment links and widget document RUB, USD and EUR as payment currencies.",
+    currency_support_note=(
+        "WATA H2H payment links and widget document RUB, USD and EUR as "
+        "payment currencies."
+    ),
     currency_support_url="https://wata.pro/api",
 )
diff --git a/backend/bot/payment_providers/yookassa.py b/backend/bot/payment_providers/yookassa.py
index 2e46788..3c420fa 100644
--- a/backend/bot/payment_providers/yookassa.py
+++ b/backend/bot/payment_providers/yookassa.py
@@ -895,7 +895,10 @@ async def process_successful_payment(
             i18n=i18n,
             user_id=user_id,
             amount=payment_value,
-            currency=amount_data.get("currency", default_payment_currency_code_for_settings(settings)),
+            currency=amount_data.get(
+                "currency",
+                default_payment_currency_code_for_settings(settings),
+            ),
             months_for_admin=int(subscription_months) if sale_mode_base == "subscription" else 0,
             traffic_gb_for_admin=(
                 traffic_amount_gb if is_traffic_sale_base(sale_mode_base) else None
@@ -2941,6 +2944,9 @@ SPEC = PaymentProviderSpec(
     presentation_class=YooKassaPresentation,
     manifest_fields=_CONFIG_MANIFEST + _PRESENTATION_MANIFEST,
     supported_currencies=("RUB",),
-    currency_support_note="YooKassa public payment API examples and limits are RUB-based; treat non-RUB as unsupported unless your YooKassa contract confirms otherwise.",
+    currency_support_note=(
+        "YooKassa public payment API examples and limits are RUB-based; "
+        "treat non-RUB as unsupported unless your YooKassa contract confirms otherwise."
+    ),
     currency_support_url="https://yookassa.ru/developers/payment-acceptance/integration-scenarios/smart-payment",
 )
diff --git a/backend/bot/services/subscription_service_impl/renewal.py b/backend/bot/services/subscription_service_impl/renewal.py
index bb4bc1f..9467039 100644
--- a/backend/bot/services/subscription_service_impl/renewal.py
+++ b/backend/bot/services/subscription_service_impl/renewal.py
@@ -43,7 +43,11 @@ class RenewalMixin:
         months = sub.duration_months or 1
         currency = default_payment_currency_code_for_settings(self.settings)
         amount = None
-        tariffs_config = self._tariffs_config() if callable(getattr(self, "_tariffs_config", None)) else None
+        tariffs_config = (
+            self._tariffs_config()
+            if callable(getattr(self, "_tariffs_config", None))
+            else None
+        )
         if tariffs_config and callable(getattr(self, "_resolve_tariff", None)):
             try:
                 tariff = self._resolve_tariff(getattr(sub, "tariff_key", None))
diff --git a/backend/config/tariffs_config.py b/backend/config/tariffs_config.py
index f9af1d4..6ba6d41 100644
--- a/backend/config/tariffs_config.py
+++ b/backend/config/tariffs_config.py
@@ -131,7 +131,11 @@ class PackageSet(RootModel[Dict[str, List[TrafficPackage]]]):
 
     @property
     def non_stars_currencies(self) -> List[str]:
-        return [currency for currency, packages in self.root.items() if currency != "stars" and packages]
+        return [
+            currency
+            for currency, packages in self.root.items()
+            if currency != "stars" and packages
+        ]
 
     def has_any(self) -> bool:
         return any(bool(packages) for packages in self.root.values())
diff --git a/tests/test_payment_provider_registry.py b/tests/test_payment_provider_registry.py
index a8bc00a..144021f 100644
--- a/tests/test_payment_provider_registry.py
+++ b/tests/test_payment_provider_registry.py
@@ -258,7 +258,10 @@ def test_payment_method_keyboard_filters_providers_by_payment_currency(monkeypat
     )
 
     callbacks = [
-        button.callback_data for row in markup.inline_keyboard for button in row if button.callback_data
+        button.callback_data
+        for row in markup.inline_keyboard
+        for button in row
+        if button.callback_data
     ]
     assert "pay_wata:1:10:subscription" in callbacks
     assert all(not callback.startswith("pay_yk:") for callback in callbacks)