[feat] Add stripe payments (#3184)

lnbits/wallets/lntips.py

@@ -7,6 +7,7 @@ from typing import AsyncGenerator, Dict, Optional
 import httpx
 from loguru import logger
 
+from lnbits.helpers import normalize_endpoint
 from lnbits.settings import settings
 
 from .base import (
@@ -36,7 +37,7 @@ class LnTipsWallet(Wallet):
                 "missing lntips_api_key or lntips_admin_key or lntips_invoice_key"
             )
 
-        self.endpoint = self.normalize_endpoint(settings.lntips_api_endpoint)
+        self.endpoint = normalize_endpoint(settings.lntips_api_endpoint)
 
         headers = {
             "Authorization": f"Basic {key}",