diff --git a/crud.py b/crud.py
index 17282d7..4cb18c2 100644
--- a/crud.py
+++ b/crud.py
@@ -1,4 +1,5 @@
 import json
+from typing import List, Optional, Tuple
 
 from lnbits.helpers import urlsafe_short_hash
 
@@ -43,7 +44,7 @@ async def create_merchant(user_id: str, m: PartialMerchant) -> Merchant:
 
 async def update_merchant(
     user_id: str, merchant_id: str, config: MerchantConfig
-) -> Merchant | None:
+) -> Optional[Merchant]:
     await db.execute(
         f"""
             UPDATE nostrmarket.merchants SET meta = :meta, time = {db.timestamp_now}
@@ -54,7 +55,7 @@ async def update_merchant(
     return await get_merchant(user_id, merchant_id)
 
 
-async def touch_merchant(user_id: str, merchant_id: str) -> Merchant | None:
+async def touch_merchant(user_id: str, merchant_id: str) -> Optional[Merchant]:
     await db.execute(
         f"""
             UPDATE nostrmarket.merchants SET time = {db.timestamp_now}
@@ -65,7 +66,7 @@ async def touch_merchant(user_id: str, merchant_id: str) -> Merchant | None:
     return await get_merchant(user_id, merchant_id)
 
 
-async def get_merchant(user_id: str, merchant_id: str) -> Merchant | None:
+async def get_merchant(user_id: str, merchant_id: str) -> Optional[Merchant]:
     row: dict = await db.fetchone(
         """SELECT * FROM nostrmarket.merchants WHERE user_id = :user_id AND id = :id""",
         {
@@ -77,7 +78,7 @@ async def get_merchant(user_id: str, merchant_id: str) -> Merchant | None:
     return Merchant.from_row(row) if row else None
 
 
-async def get_merchant_by_pubkey(public_key: str) -> Merchant | None:
+async def get_merchant_by_pubkey(public_key: str) -> Optional[Merchant]:
     row: dict = await db.fetchone(
         """SELECT * FROM nostrmarket.merchants WHERE public_key = :public_key""",
         {"public_key": public_key},
@@ -86,7 +87,7 @@ async def get_merchant_by_pubkey(public_key: str) -> Merchant | None:
     return Merchant.from_row(row) if row else None
 
 
-async def get_merchants_ids_with_pubkeys() -> list[tuple[str, str]]:
+async def get_merchants_ids_with_pubkeys() -> List[Tuple[str, str]]:
     rows: list[dict] = await db.fetchall(
         """SELECT id, public_key FROM nostrmarket.merchants""",
     )
@@ -94,7 +95,7 @@ async def get_merchants_ids_with_pubkeys() -> list[tuple[str, str]]:
     return [(row["id"], row["public_key"]) for row in rows]
 
 
-async def get_merchant_for_user(user_id: str) -> Merchant | None:
+async def get_merchant_for_user(user_id: str) -> Optional[Merchant]:
     row: dict = await db.fetchone(
         """SELECT * FROM nostrmarket.merchants WHERE user_id = :user_id """,
         {"user_id": user_id},
@@ -137,7 +138,7 @@ async def create_zone(merchant_id: str, data: Zone) -> Zone:
     return zone
 
 
-async def update_zone(merchant_id: str, z: Zone) -> Zone | None:
+async def update_zone(merchant_id: str, z: Zone) -> Optional[Zone]:
     await db.execute(
         """
         UPDATE nostrmarket.zones
@@ -156,7 +157,7 @@ async def update_zone(merchant_id: str, z: Zone) -> Zone | None:
     return await get_zone(merchant_id, z.id)
 
 
-async def get_zone(merchant_id: str, zone_id: str) -> Zone | None:
+async def get_zone(merchant_id: str, zone_id: str) -> Optional[Zone]:
     row: dict = await db.fetchone(
         "SELECT * FROM nostrmarket.zones WHERE merchant_id = :merchant_id AND id = :id",
         {
@@ -167,7 +168,7 @@ async def get_zone(merchant_id: str, zone_id: str) -> Zone | None:
     return Zone.from_row(row) if row else None
 
 
-async def get_zones(merchant_id: str) -> list[Zone]:
+async def get_zones(merchant_id: str) -> List[Zone]:
     rows: list[dict] = await db.fetchall(
         "SELECT * FROM nostrmarket.zones WHERE merchant_id = :merchant_id",
         {"merchant_id": merchant_id},
@@ -234,7 +235,7 @@ async def create_stall(merchant_id: str, data: Stall) -> Stall:
     return stall
 
 
-async def get_stall(merchant_id: str, stall_id: str) -> Stall | None:
+async def get_stall(merchant_id: str, stall_id: str) -> Optional[Stall]:
     row: dict = await db.fetchone(
         """
         SELECT * FROM nostrmarket.stalls
@@ -248,7 +249,7 @@ async def get_stall(merchant_id: str, stall_id: str) -> Stall | None:
     return Stall.from_row(row) if row else None
 
 
-async def get_stalls(merchant_id: str, pending: bool | None = False) -> list[Stall]:
+async def get_stalls(merchant_id: str, pending: Optional[bool] = False) -> List[Stall]:
     rows: list[dict] = await db.fetchall(
         """
         SELECT * FROM nostrmarket.stalls
@@ -273,7 +274,7 @@ async def get_last_stall_update_time() -> int:
     return row["event_created_at"] or 0 if row else 0
 
 
-async def update_stall(merchant_id: str, stall: Stall) -> Stall | None:
+async def update_stall(merchant_id: str, stall: Stall) -> Optional[Stall]:
     await db.execute(
         """
             UPDATE nostrmarket.stalls
@@ -397,7 +398,9 @@ async def update_product(merchant_id: str, product: Product) -> Product:
     return updated_product
 
 
-async def update_product_quantity(product_id: str, new_quantity: int) -> Product | None:
+async def update_product_quantity(
+    product_id: str, new_quantity: int
+) -> Optional[Product]:
     await db.execute(
         """
             UPDATE nostrmarket.products SET quantity = :quantity
@@ -412,7 +415,7 @@ async def update_product_quantity(product_id: str, new_quantity: int) -> Product
     return Product.from_row(row) if row else None
 
 
-async def get_product(merchant_id: str, product_id: str) -> Product | None:
+async def get_product(merchant_id: str, product_id: str) -> Optional[Product]:
     row: dict = await db.fetchone(
         """
             SELECT * FROM nostrmarket.products
@@ -428,8 +431,8 @@ async def get_product(merchant_id: str, product_id: str) -> Product | None:
 
 
 async def get_products(
-    merchant_id: str, stall_id: str, pending: bool | None = False
-) -> list[Product]:
+    merchant_id: str, stall_id: str, pending: Optional[bool] = False
+) -> List[Product]:
     rows: list[dict] = await db.fetchall(
         """
         SELECT * FROM nostrmarket.products
@@ -442,8 +445,8 @@ async def get_products(
 
 
 async def get_products_by_ids(
-    merchant_id: str, product_ids: list[str]
-) -> list[Product]:
+    merchant_id: str, product_ids: List[str]
+) -> List[Product]:
     # todo: revisit
 
     keys = []
@@ -464,7 +467,7 @@ async def get_products_by_ids(
     return [Product.from_row(row) for row in rows]
 
 
-async def get_wallet_for_product(product_id: str) -> str | None:
+async def get_wallet_for_product(product_id: str) -> Optional[str]:
     row: dict = await db.fetchone(
         """
         SELECT s.wallet as wallet FROM nostrmarket.products p
@@ -571,7 +574,7 @@ async def create_order(merchant_id: str, o: Order) -> Order:
     return order
 
 
-async def get_order(merchant_id: str, order_id: str) -> Order | None:
+async def get_order(merchant_id: str, order_id: str) -> Optional[Order]:
     row: dict = await db.fetchone(
         """
             SELECT * FROM nostrmarket.orders
@@ -585,7 +588,7 @@ async def get_order(merchant_id: str, order_id: str) -> Order | None:
     return Order.from_row(row) if row else None
 
 
-async def get_order_by_event_id(merchant_id: str, event_id: str) -> Order | None:
+async def get_order_by_event_id(merchant_id: str, event_id: str) -> Optional[Order]:
     row: dict = await db.fetchone(
         """
             SELECT * FROM nostrmarket.orders
@@ -599,7 +602,7 @@ async def get_order_by_event_id(merchant_id: str, event_id: str) -> Order | None
     return Order.from_row(row) if row else None
 
 
-async def get_orders(merchant_id: str, **kwargs) -> list[Order]:
+async def get_orders(merchant_id: str, **kwargs) -> List[Order]:
     q = " AND ".join(
         [
             f"{field[0]} = :{field[0]}"
@@ -626,7 +629,7 @@ async def get_orders(merchant_id: str, **kwargs) -> list[Order]:
 
 async def get_orders_for_stall(
     merchant_id: str, stall_id: str, **kwargs
-) -> list[Order]:
+) -> List[Order]:
     q = " AND ".join(
         [
             f"{field[0]} = :{field[0]}"
@@ -651,7 +654,7 @@ async def get_orders_for_stall(
     return [Order.from_row(row) for row in rows]
 
 
-async def update_order(merchant_id: str, order_id: str, **kwargs) -> Order | None:
+async def update_order(merchant_id: str, order_id: str, **kwargs) -> Optional[Order]:
     q = ", ".join(
         [
             f"{field[0]} = :{field[0]}"
@@ -675,7 +678,7 @@ async def update_order(merchant_id: str, order_id: str, **kwargs) -> Order | Non
     return await get_order(merchant_id, order_id)
 
 
-async def update_order_paid_status(order_id: str, paid: bool) -> Order | None:
+async def update_order_paid_status(order_id: str, paid: bool) -> Optional[Order]:
     await db.execute(
         "UPDATE nostrmarket.orders SET paid = :paid  WHERE id = :id",
         {"paid": paid, "id": order_id},
@@ -689,7 +692,7 @@ async def update_order_paid_status(order_id: str, paid: bool) -> Order | None:
 
 async def update_order_shipped_status(
     merchant_id: str, order_id: str, shipped: bool
-) -> Order | None:
+) -> Optional[Order]:
     await db.execute(
         """
             UPDATE nostrmarket.orders
@@ -753,7 +756,7 @@ async def create_direct_message(
     return msg
 
 
-async def get_direct_message(merchant_id: str, dm_id: str) -> DirectMessage | None:
+async def get_direct_message(merchant_id: str, dm_id: str) -> Optional[DirectMessage]:
     row: dict = await db.fetchone(
         """
             SELECT * FROM nostrmarket.direct_messages
@@ -769,7 +772,7 @@ async def get_direct_message(merchant_id: str, dm_id: str) -> DirectMessage | No
 
 async def get_direct_message_by_event_id(
     merchant_id: str, event_id: str
-) -> DirectMessage | None:
+) -> Optional[DirectMessage]:
     row: dict = await db.fetchone(
         """
         SELECT * FROM nostrmarket.direct_messages
@@ -783,7 +786,7 @@ async def get_direct_message_by_event_id(
     return DirectMessage.from_row(row) if row else None
 
 
-async def get_direct_messages(merchant_id: str, public_key: str) -> list[DirectMessage]:
+async def get_direct_messages(merchant_id: str, public_key: str) -> List[DirectMessage]:
     rows: list[dict] = await db.fetchall(
         """
         SELECT * FROM nostrmarket.direct_messages
@@ -795,7 +798,7 @@ async def get_direct_messages(merchant_id: str, public_key: str) -> list[DirectM
     return [DirectMessage.from_row(row) for row in rows]
 
 
-async def get_orders_from_direct_messages(merchant_id: str) -> list[DirectMessage]:
+async def get_orders_from_direct_messages(merchant_id: str) -> List[DirectMessage]:
     rows: list[dict] = await db.fetchall(
         """
         SELECT * FROM nostrmarket.direct_messages
@@ -856,7 +859,7 @@ async def create_customer(merchant_id: str, data: Customer) -> Customer:
     return customer
 
 
-async def get_customer(merchant_id: str, public_key: str) -> Customer | None:
+async def get_customer(merchant_id: str, public_key: str) -> Optional[Customer]:
     row: dict = await db.fetchone(
         """
             SELECT * FROM nostrmarket.customers
@@ -870,7 +873,7 @@ async def get_customer(merchant_id: str, public_key: str) -> Customer | None:
     return Customer.from_row(row) if row else None
 
 
-async def get_customers(merchant_id: str) -> list[Customer]:
+async def get_customers(merchant_id: str) -> List[Customer]:
     rows: list[dict] = await db.fetchall(
         "SELECT * FROM nostrmarket.customers WHERE merchant_id = :merchant_id",
         {"merchant_id": merchant_id},
@@ -878,7 +881,7 @@ async def get_customers(merchant_id: str) -> list[Customer]:
     return [Customer.from_row(row) for row in rows]
 
 
-async def get_all_unique_customers() -> list[Customer]:
+async def get_all_unique_customers() -> List[Customer]:
     q = """
             SELECT public_key, MAX(merchant_id) as merchant_id, MAX(event_created_at)
             FROM nostrmarket.customers
diff --git a/helpers.py b/helpers.py
index bb5efaf..69d1f2f 100644
--- a/helpers.py
+++ b/helpers.py
@@ -1,5 +1,6 @@
 import base64
 import secrets
+from typing import Optional
 
 import secp256k1
 from bech32 import bech32_decode, convertbits
@@ -32,7 +33,7 @@ def decrypt_message(encoded_message: str, encryption_key) -> str:
     return unpadded_data.decode()
 
 
-def encrypt_message(message: str, encryption_key, iv: bytes | None = None) -> str:
+def encrypt_message(message: str, encryption_key, iv: Optional[bytes] = None) -> str:
     padder = padding.PKCS7(128).padder()
     padded_data = padder.update(message.encode()) + padder.finalize()
 
diff --git a/models.py b/models.py
index 92992e2..a6f3c3f 100644
--- a/models.py
+++ b/models.py
@@ -2,7 +2,7 @@ import json
 import time
 from abc import abstractmethod
 from enum import Enum
-from typing import Any
+from typing import Any, List, Optional, Tuple
 
 from lnbits.utils.exchange_rates import btc_price, fiat_amount_as_satoshis
 from pydantic import BaseModel
@@ -32,17 +32,17 @@ class Nostrable:
 
 
 class MerchantProfile(BaseModel):
-    name: str | None = None
-    about: str | None = None
-    picture: str | None = None
+    name: Optional[str] = None
+    about: Optional[str] = None
+    picture: Optional[str] = None
 
 
 class MerchantConfig(MerchantProfile):
-    event_id: str | None = None
-    sync_from_nostr: bool = False
+    event_id: Optional[str] = None
+    sync_from_nostr = False
     # TODO: switched to True for AIO demo; determine if we leave this as True
     active: bool = True
-    restore_in_progress: bool | None = False
+    restore_in_progress: Optional[bool] = False
 
 
 class CreateMerchantRequest(BaseModel):
@@ -57,7 +57,7 @@ class PartialMerchant(BaseModel):
 
 class Merchant(PartialMerchant, Nostrable):
     id: str
-    time: int | None = 0
+    time: Optional[int] = 0
 
     def sign_hash(self, hash_: bytes) -> str:
         return sign_message_hash(self.private_key, hash_)
@@ -127,11 +127,11 @@ class Merchant(PartialMerchant, Nostrable):
 
 ######################################## ZONES ########################################
 class Zone(BaseModel):
-    id: str | None = None
-    name: str | None = None
+    id: Optional[str] = None
+    name: Optional[str] = None
     currency: str
     cost: float
-    countries: list[str] = []
+    countries: List[str] = []
 
     @classmethod
     def from_row(cls, row: dict) -> "Zone":
@@ -144,22 +144,22 @@ class Zone(BaseModel):
 
 
 class StallConfig(BaseModel):
-    image_url: str | None = None
-    description: str | None = None
+    image_url: Optional[str] = None
+    description: Optional[str] = None
 
 
 class Stall(BaseModel, Nostrable):
-    id: str | None = None
+    id: Optional[str] = None
     wallet: str
     name: str
     currency: str = "sat"
-    shipping_zones: list[Zone] = []
+    shipping_zones: List[Zone] = []
     config: StallConfig = StallConfig()
     pending: bool = False
 
     """Last published nostr event for this Stall"""
-    event_id: str | None = None
-    event_created_at: int | None = None
+    event_id: Optional[str] = None
+    event_created_at: Optional[int] = None
 
     def validate_stall(self):
         for z in self.shipping_zones:
@@ -217,19 +217,19 @@ class ProductShippingCost(BaseModel):
 
 
 class ProductConfig(BaseModel):
-    description: str | None = None
-    currency: str | None = None
-    use_autoreply: bool | None = False
-    autoreply_message: str | None = None
-    shipping: list[ProductShippingCost] = []
+    description: Optional[str] = None
+    currency: Optional[str] = None
+    use_autoreply: Optional[bool] = False
+    autoreply_message: Optional[str] = None
+    shipping: List[ProductShippingCost] = []
 
 
 class Product(BaseModel, Nostrable):
-    id: str | None = None
+    id: Optional[str] = None
     stall_id: str
     name: str
-    categories: list[str] = []
-    images: list[str] = []
+    categories: List[str] = []
+    images: List[str] = []
     price: float
     quantity: int
     active: bool = True
@@ -237,8 +237,8 @@ class Product(BaseModel, Nostrable):
     config: ProductConfig = ProductConfig()
 
     """Last published nostr event for this Product"""
-    event_id: str | None = None
-    event_created_at: int | None = None
+    event_id: Optional[str] = None
+    event_created_at: Optional[int] = None
 
     def to_nostr_event(self, pubkey: str) -> NostrEvent:
         content = {
@@ -295,7 +295,7 @@ class ProductOverview(BaseModel):
     id: str
     name: str
     price: float
-    product_shipping_cost: float | None = None
+    product_shipping_cost: Optional[float] = None
 
     @classmethod
     def from_product(cls, p: Product) -> "ProductOverview":
@@ -312,21 +312,21 @@ class OrderItem(BaseModel):
 
 
 class OrderContact(BaseModel):
-    nostr: str | None = None
-    phone: str | None = None
-    email: str | None = None
+    nostr: Optional[str] = None
+    phone: Optional[str] = None
+    email: Optional[str] = None
 
 
 class OrderExtra(BaseModel):
-    products: list[ProductOverview]
+    products: List[ProductOverview]
     currency: str
     btc_price: str
     shipping_cost: float = 0
     shipping_cost_sat: float = 0
-    fail_message: str | None = None
+    fail_message: Optional[str] = None
 
     @classmethod
-    async def from_products(cls, products: list[Product]):
+    async def from_products(cls, products: List[Product]):
         currency = products[0].config.currency if len(products) else "sat"
         exchange_rate = (
             await btc_price(currency) if currency and currency != "sat" else 1
@@ -342,19 +342,19 @@ class OrderExtra(BaseModel):
 
 class PartialOrder(BaseModel):
     id: str
-    event_id: str | None = None
-    event_created_at: int | None = None
+    event_id: Optional[str] = None
+    event_created_at: Optional[int] = None
     public_key: str
     merchant_public_key: str
     shipping_id: str
-    items: list[OrderItem]
-    contact: OrderContact | None = None
-    address: str | None = None
+    items: List[OrderItem]
+    contact: Optional[OrderContact] = None
+    address: Optional[str] = None
 
     def validate_order(self):
         assert len(self.items) != 0, f"Order has no items. Order: '{self.id}'"
 
-    def validate_order_items(self, product_list: list[Product]):
+    def validate_order_items(self, product_list: List[Product]):
         assert len(self.items) != 0, f"Order has no items. Order: '{self.id}'"
         assert (
             len(product_list) != 0
@@ -375,8 +375,8 @@ class PartialOrder(BaseModel):
                 )
 
     async def costs_in_sats(
-        self, products: list[Product], shipping_id: str, stall_shipping_cost: float
-    ) -> tuple[float, float]:
+        self, products: List[Product], shipping_id: str, stall_shipping_cost: float
+    ) -> Tuple[float, float]:
         product_prices = {}
         for p in products:
             product_shipping_cost = next(
@@ -405,7 +405,7 @@ class PartialOrder(BaseModel):
         return product_cost, stall_shipping_cost
 
     def receipt(
-        self, products: list[Product], shipping_id: str, stall_shipping_cost: float
+        self, products: List[Product], shipping_id: str, stall_shipping_cost: float
     ) -> str:
         if len(products) == 0:
             return "[No Products]"
@@ -454,7 +454,7 @@ class Order(PartialOrder):
     total: float
     paid: bool = False
     shipped: bool = False
-    time: int | None = None
+    time: Optional[int] = None
     extra: OrderExtra
 
     @classmethod
@@ -468,14 +468,14 @@ class Order(PartialOrder):
 
 class OrderStatusUpdate(BaseModel):
     id: str
-    message: str | None = None
-    paid: bool | None = False
-    shipped: bool | None = None
+    message: Optional[str] = None
+    paid: Optional[bool] = False
+    shipped: Optional[bool] = None
 
 
 class OrderReissue(BaseModel):
     id: str
-    shipping_id: str | None = None
+    shipping_id: Optional[str] = None
 
 
 class PaymentOption(BaseModel):
@@ -485,8 +485,8 @@ class PaymentOption(BaseModel):
 
 class PaymentRequest(BaseModel):
     id: str
-    message: str | None = None
-    payment_options: list[PaymentOption]
+    message: Optional[str] = None
+    payment_options: List[PaymentOption]
 
 
 ######################################## MESSAGE #######################################
@@ -502,16 +502,16 @@ class DirectMessageType(Enum):
 
 
 class PartialDirectMessage(BaseModel):
-    event_id: str | None = None
-    event_created_at: int | None = None
+    event_id: Optional[str] = None
+    event_created_at: Optional[int] = None
     message: str
     public_key: str
     type: int = DirectMessageType.PLAIN_TEXT.value
     incoming: bool = False
-    time: int | None = None
+    time: Optional[int] = None
 
     @classmethod
-    def parse_message(cls, msg) -> tuple[DirectMessageType, Any | None]:
+    def parse_message(cls, msg) -> Tuple[DirectMessageType, Optional[Any]]:
         try:
             msg_json = json.loads(msg)
             if "type" in msg_json:
@@ -534,15 +534,15 @@ class DirectMessage(PartialDirectMessage):
 
 
 class CustomerProfile(BaseModel):
-    name: str | None = None
-    about: str | None = None
+    name: Optional[str] = None
+    about: Optional[str] = None
 
 
 class Customer(BaseModel):
     merchant_id: str
     public_key: str
-    event_created_at: int | None = None
-    profile: CustomerProfile | None = None
+    event_created_at: Optional[int] = None
+    profile: Optional[CustomerProfile] = None
     unread_messages: int = 0
 
     @classmethod
diff --git a/services.py b/services.py
index 59d02ad..05461fc 100644
--- a/services.py
+++ b/services.py
@@ -1,7 +1,8 @@
 import asyncio
 import json
+from typing import List, Optional, Tuple
 
-from bolt11 import decode
+from lnbits.bolt11 import decode
 from lnbits.core.crud import get_wallet
 from lnbits.core.services import create_invoice, websocket_updater
 from loguru import logger
@@ -59,7 +60,7 @@ from .nostr.event import NostrEvent
 
 async def create_new_order(
     merchant_public_key: str, data: PartialOrder
-) -> PaymentRequest | None:
+) -> Optional[PaymentRequest]:
     merchant = await get_merchant_by_pubkey(merchant_public_key)
     assert merchant, "Cannot find merchant for order!"
 
@@ -144,7 +145,7 @@ async def update_merchant_to_nostr(
     merchant: Merchant, delete_merchant=False
 ) -> Merchant:
     stalls = await get_stalls(merchant.id)
-    event: NostrEvent | None = None
+    event: Optional[NostrEvent] = None
     for stall in stalls:
         assert stall.id
         products = await get_products(merchant.id, stall.id)
@@ -229,7 +230,7 @@ async def notify_client_of_order_status(
 
 async def update_products_for_order(
     merchant: Merchant, order: Order
-) -> tuple[bool, str]:
+) -> Tuple[bool, str]:
     product_ids = [i.product_id for i in order.items]
     success, products, message = await compute_products_new_quantity(
         merchant.id, product_ids, order.items
@@ -297,9 +298,9 @@ async def send_dm(
 
 
 async def compute_products_new_quantity(
-    merchant_id: str, product_ids: list[str], items: list[OrderItem]
-) -> tuple[bool, list[Product], str]:
-    products: list[Product] = await get_products_by_ids(merchant_id, product_ids)
+    merchant_id: str, product_ids: List[str], items: List[OrderItem]
+) -> Tuple[bool, List[Product], str]:
+    products: List[Product] = await get_products_by_ids(merchant_id, product_ids)
 
     for p in products:
         required_quantity = next(
@@ -332,6 +333,7 @@ async def process_nostr_message(msg: str):
                 return
             _, event = rest
             event = NostrEvent(**event)
+            
             if event.kind == 0:
                 await _handle_customer_profile_update(event)
             elif event.kind == 4:
@@ -502,7 +504,7 @@ async def _handle_outgoing_dms(
 
 async def _handle_incoming_structured_dm(
     merchant: Merchant, dm: DirectMessage, json_data: dict
-) -> tuple[DirectMessageType, str | None]:
+) -> Tuple[DirectMessageType, Optional[str]]:
     try:
         if dm.type == DirectMessageType.CUSTOMER_ORDER.value and merchant.config.active:
             json_resp = await _handle_new_order(
diff --git a/views_api.py b/views_api.py
index ffd6ef1..f858397 100644
--- a/views_api.py
+++ b/views_api.py
@@ -1,12 +1,13 @@
 import json
 from http import HTTPStatus
+from typing import List, Optional
 
 from fastapi import Depends
 from fastapi.exceptions import HTTPException
-from lnbits.core.models import WalletTypeInfo
 from lnbits.core.crud import get_account, update_account
 from lnbits.core.services import websocket_updater
 from lnbits.decorators import (
+    WalletTypeInfo,
     require_admin_key,
     require_invoice_key,
 )
@@ -167,7 +168,7 @@ async def api_create_merchant(
 @nostrmarket_ext.get("/api/v1/merchant")
 async def api_get_merchant(
     wallet: WalletTypeInfo = Depends(require_invoice_key),
-) -> Merchant | None:
+) -> Optional[Merchant]:
 
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
@@ -335,7 +336,7 @@ async def api_delete_merchant_on_nostr(
 @nostrmarket_ext.get("/api/v1/zone")
 async def api_get_zones(
     wallet: WalletTypeInfo = Depends(require_invoice_key),
-) -> list[Zone]:
+) -> List[Zone]:
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
         assert merchant, "Merchant cannot be found"
@@ -535,7 +536,7 @@ async def api_get_stall(
 
 @nostrmarket_ext.get("/api/v1/stall")
 async def api_get_stalls(
-    pending: bool | None = False,
+    pending: Optional[bool] = False,
     wallet: WalletTypeInfo = Depends(require_invoice_key),
 ):
     try:
@@ -559,7 +560,7 @@ async def api_get_stalls(
 @nostrmarket_ext.get("/api/v1/stall/product/{stall_id}")
 async def api_get_stall_products(
     stall_id: str,
-    pending: bool | None = False,
+    pending: Optional[bool] = False,
     wallet: WalletTypeInfo = Depends(require_invoice_key),
 ):
     try:
@@ -583,9 +584,9 @@ async def api_get_stall_products(
 @nostrmarket_ext.get("/api/v1/stall/order/{stall_id}")
 async def api_get_stall_orders(
     stall_id: str,
-    paid: bool | None = None,
-    shipped: bool | None = None,
-    pubkey: str | None = None,
+    paid: Optional[bool] = None,
+    shipped: Optional[bool] = None,
+    pubkey: Optional[str] = None,
     wallet: WalletTypeInfo = Depends(require_invoice_key),
 ):
     try:
@@ -719,7 +720,7 @@ async def api_update_product(
 async def api_get_product(
     product_id: str,
     wallet: WalletTypeInfo = Depends(require_invoice_key),
-) -> Product | None:
+) -> Optional[Product]:
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
         assert merchant, "Merchant cannot be found"
@@ -804,9 +805,9 @@ async def api_get_order(
 
 @nostrmarket_ext.get("/api/v1/order")
 async def api_get_orders(
-    paid: bool | None = None,
-    shipped: bool | None = None,
-    pubkey: str | None = None,
+    paid: Optional[bool] = None,
+    shipped: Optional[bool] = None,
+    pubkey: Optional[str] = None,
     wallet: WalletTypeInfo = Depends(require_invoice_key),
 ):
     try:
@@ -892,7 +893,7 @@ async def api_update_order_status(
 async def api_restore_order(
     event_id: str,
     wallet: WalletTypeInfo = Depends(require_admin_key),
-) -> Order | None:
+) -> Optional[Order]:
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
         assert merchant, "Merchant cannot be found"
@@ -1019,7 +1020,7 @@ async def api_reissue_order_invoice(
 @nostrmarket_ext.get("/api/v1/message/{public_key}")
 async def api_get_messages(
     public_key: str, wallet: WalletTypeInfo = Depends(require_invoice_key)
-) -> list[DirectMessage]:
+) -> List[DirectMessage]:
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
         assert merchant, "Merchant cannot be found"
@@ -1075,7 +1076,7 @@ async def api_create_message(
 @nostrmarket_ext.get("/api/v1/customer")
 async def api_get_customers(
     wallet: WalletTypeInfo = Depends(require_invoice_key),
-) -> list[Customer]:
+) -> List[Customer]:
     try:
         merchant = await get_merchant_for_user(wallet.wallet.user)
         assert merchant, "Merchant cannot be found"