diff --git a/blockchain_integration/pi_network/payment_gateways/paypal.py b/blockchain_integration/pi_network/payment_gateways/paypal.py
index ddaf56908..b73e40bce 100644
--- a/blockchain_integration/pi_network/payment_gateways/paypal.py
+++ b/blockchain_integration/pi_network/payment_gateways/paypal.py
@@ -1,46 +1,46 @@
 import paypalrestsdk
 
+
 class PayPalPaymentGateway:
-    def __init__(self, client_id, client_secret, mode='sandbox'):
+    def __init__(self, client_id, client_secret, mode="sandbox"):
         self.client_id = client_id
         self.client_secret = client_secret
         self.mode = mode
-        paypalrestsdk.configure({
-            'mode': mode,
-            'client_id': client_id,
-            'client_secret': client_secret
-        })
+        paypalrestsdk.configure(
+            {"mode": mode, "client_id": client_id, "client_secret": client_secret}
+        )
 
-    def create_payment(self, amount, currency, intent='sale'):
-        payment = paypalrestsdk.Payment({
-            'intent': intent,
-            'payer': {
-                'payment_method': 'paypal'
-            },
-            'redirect_urls': {
-                'return_url': 'http://return.url',
-                'cancel_url': 'http://cancel.url'
-            },
-            'transactions': [{
-                'item_list': {
-                    'items': [{
-                        'name': 'Item Name',
-                        'sku': 'Item SKU',
-                        'price': str(amount),
-                        'currency': currency,
-                        'quantity': 1
-                    }]
-                },
-                'amount': {
-                    'currency': currency,
-                    'total': str(amount)
+    def create_payment(self, amount, currency, intent="sale"):
+        payment = paypalrestsdk.Payment(
+            {
+                "intent": intent,
+                "payer": {"payment_method": "paypal"},
+                "redirect_urls": {
+                    "return_url": "http://return.url",
+                    "cancel_url": "http://cancel.url",
                 },
-                'description': 'This is the payment description.'
-            }]
-        })
+                "transactions": [
+                    {
+                        "item_list": {
+                            "items": [
+                                {
+                                    "name": "Item Name",
+                                    "sku": "Item SKU",
+                                    "price": str(amount),
+                                    "currency": currency,
+                                    "quantity": 1,
+                                }
+                            ]
+                        },
+                        "amount": {"currency": currency, "total": str(amount)},
+                        "description": "This is the payment description.",
+                    }
+                ],
+            }
+        )
         return payment
 
     def execute_payment(self, payment_id, payer_id):
         payment = paypalrestsdk.Payment.find(payment_id)
-        payment.execute({'payer_id': payer_id})
+        payment.execute({"payer_id": payer_id})
         return payment