diff --git a/.env.example b/.env.example
index 28e52698..0a3f8f14 100644
--- a/.env.example
+++ b/.env.example
@@ -6,15 +6,16 @@ PORT=5000
 
 DEBUG=false
 
-# User IDs seperated by comma
+# Allow users and admins by user IDs (comma separated list)
+LNBITS_ALLOWED_USERS=""
 LNBITS_ADMIN_USERS=""
 # Extensions only admin can access
-LNBITS_ADMIN_EXTENSIONS="ngrok, admin" 
+LNBITS_ADMIN_EXTENSIONS="ngrok, admin"
 # Enable Admin GUI, available for the first user in LNBITS_ADMIN_USERS if available
-LNBITS_ADMIN_UI=false 
+LNBITS_ADMIN_UI=false
 
 # Restricts access, User IDs seperated by comma
-LNBITS_ALLOWED_USERS="" 
+LNBITS_ALLOWED_USERS=""
 
 LNBITS_DEFAULT_WALLET_NAME="LNbits wallet"
 
@@ -110,6 +111,6 @@ LNTIPS_API_KEY=LNTIPS_ADMIN_KEY
 LNTIPS_API_ENDPOINT=https://ln.tips
 
 # Cashu Mint
-# Use a long-enough random (!) private key. 
+# Use a long-enough random (!) private key.
 # Once set, you cannot change this key as for now.
 CASHU_PRIVATE_KEY="SuperSecretPrivateKey"
diff --git a/lnbits/db.py b/lnbits/db.py
index bd42272d..00bf849b 100644
--- a/lnbits/db.py
+++ b/lnbits/db.py
@@ -86,7 +86,8 @@ class Connection(Compat):
                 return raw_html
 
         # tuple to list and back to tuple
-        values = tuple([cleanhtml(l) for l in list(values)])
+        value_list = [values] if isinstance(values, str) else list(values)
+        values = tuple([cleanhtml(l) for l in value_list])
         return values
 
     async def fetchall(self, query: str, values: tuple = ()) -> list:
diff --git a/lnbits/extensions/satspay/crud.py b/lnbits/extensions/satspay/crud.py
index 7e34f6f8..bc364323 100644
--- a/lnbits/extensions/satspay/crud.py
+++ b/lnbits/extensions/satspay/crud.py
@@ -16,6 +16,7 @@ from .models import Charges, CreateCharge, SatsPayThemes
 
 
 async def create_charge(user: str, data: CreateCharge) -> Charges:
+    data = CreateCharge(**data.dict())
     charge_id = urlsafe_short_hash()
     if data.onchainwallet:
         config = await get_config(user)
diff --git a/lnbits/extensions/satspay/models.py b/lnbits/extensions/satspay/models.py
index cfb3c7ac..4d30f915 100644
--- a/lnbits/extensions/satspay/models.py
+++ b/lnbits/extensions/satspay/models.py
@@ -6,6 +6,10 @@ from typing import Optional
 from fastapi.param_functions import Query
 from pydantic import BaseModel
 
+DEFAULT_MEMPOOL_CONFIG = (
+    '{"mempool_endpoint": "https://mempool.space", "network": "Mainnet"}'
+)
+
 
 class CreateCharge(BaseModel):
     onchainwallet: str = Query(None)
@@ -17,7 +21,7 @@ class CreateCharge(BaseModel):
     custom_css: Optional[str]
     time: int = Query(..., ge=1)
     amount: int = Query(..., ge=1)
-    extra: str = "{}"
+    extra: str = DEFAULT_MEMPOOL_CONFIG
 
 
 class ChargeConfig(BaseModel):
@@ -38,8 +42,13 @@ class Charges(BaseModel):
     webhook: Optional[str]
     completelink: Optional[str]
     completelinktext: Optional[str] = "Back to Merchant"
+<<<<<<< HEAD
     extra: str = "{}"
     custom_css: Optional[str]
+=======
+    custom_css: Optional[str]
+    extra: str = DEFAULT_MEMPOOL_CONFIG
+>>>>>>> main
     time: int
     amount: int
     balance: int
diff --git a/lnbits/extensions/satspay/views_api.py b/lnbits/extensions/satspay/views_api.py
index 3836356a..21b4149d 100644
--- a/lnbits/extensions/satspay/views_api.py
+++ b/lnbits/extensions/satspay/views_api.py
@@ -5,6 +5,7 @@ from fastapi.params import Depends
 from loguru import logger
 from starlette.exceptions import HTTPException
 
+from lnbits.core.crud import get_wallet
 from lnbits.decorators import (
     WalletTypeInfo,
     get_key_type,
diff --git a/lnbits/extensions/watchonly/crud.py b/lnbits/extensions/watchonly/crud.py
index c4a1df72..61e47cfe 100644
--- a/lnbits/extensions/watchonly/crud.py
+++ b/lnbits/extensions/watchonly/crud.py
@@ -203,7 +203,7 @@ async def update_address(id: str, **kwargs) -> Optional[Address]:
         f"""UPDATE watchonly.addresses SET {q} WHERE id = ? """,
         (*kwargs.values(), id),
     )
-    row = await db.fetchone("SELECT * FROM watchonly.addresses WHERE id = ?", (id))
+    row = await db.fetchone("SELECT * FROM watchonly.addresses WHERE id = ?", (id,))
     return Address.from_row(row) if row else None