diff --git a/README.md b/README.md
index 2dcc0a3..6402f65 100644
--- a/README.md
+++ b/README.md
@@ -78,14 +78,14 @@ from aaio import AAIO
 
 
 async def main():
-    client = AAIO('MERCHANT ID', 'SECRET KEY', 'API KEY')
+    client = AAIO('MERCHANT ID', 'SECRET KEY', api_key='API KEY')
     
     
     # New way to create payments
     payment_url = await client.get_pay_url(100, 'my_order_id', 'My order description', 'qiwi', 'support@aaio.so',
                                         'referral code', currency='USD',
                                         language='en')
-    print(payment_url['url'])  # Prints payment url for customer
+    print(payment_url)  # Prints payment url for customer
     
     
     # DEPRECATED METHOD
@@ -108,7 +108,7 @@ from aaio import AAIO
 
 
 async def main():
-    client = AAIO('MERCHANT ID', 'SECRET KEY', 'API KEY')
+    client = AAIO('MERCHANT ID', 'SECRET KEY', api_key='API KEY')
     payoff = await client.create_payoff('qiwi', 100.35, '79998887766', 'my_payoff_id')
     print(payoff.status)  # in_progress
 
diff --git a/src/aaio/client.py b/src/aaio/client.py
index 5035009..219b2aa 100644
--- a/src/aaio/client.py
+++ b/src/aaio/client.py
@@ -18,7 +18,7 @@ class AAIO:
     API for https://aaio.so/
     """
 
-    def __init__(self, merchant_id: str, secret_1: str, secret_2: str | None = None, api_key: str | None = None,
+    def __init__(self, merchant_id: str, secret_1: str | None = None, secret_2: str | None = None, api_key: str | None = None,
                  default_currency: str = 'RUB',
                  base_url: str = 'https://aaio.so'):
         """
@@ -54,6 +54,9 @@ def __generate_sign(self, amount: float, order_id: str, currency: str) -> str:
 
         """
 
+        if self._secret_1 is None:
+            raise ValueError('Secret key #1 is required for payment URL generation')
+
         params = f':'.join([
             self._merchant_id,
             str(amount),
@@ -160,7 +163,7 @@ async def get_payment_info(self, order_id: str) -> PaymentInfo:
 
         """
 
-        if not self._api_key:
+        if self._api_key is None:
             raise ValueError('API key is required for this method')
 
         params = {
diff --git a/src/aaio/models/payment_methods.py b/src/aaio/models/payment_methods.py
index b4a2f97..bf8f358 100644
--- a/src/aaio/models/payment_methods.py
+++ b/src/aaio/models/payment_methods.py
@@ -14,6 +14,9 @@ class PaymentMethod(BaseModel):
     name: str
     min: PaymentMethodAmounts
     max: PaymentMethodAmounts
+    commission_percent: float
+    commission_user_percent: float
+    commission_merchant_percent: float
     commission_type: str