feat: split bills for one deal

external/billing/billing_client.py

@@ -1,5 +1,6 @@
 import aiohttp
 
+from backend.config import BILLING_URL
 from .schemas import *
 
 
@@ -9,7 +10,7 @@ class BillingClient:
         self.headers = {
             'Authorization': f'Bearer {self.api_key}'
         }
-        self.base_url = 'https://billing.denco.store'
+        self.base_url = BILLING_URL
 
     async def _method(self, http_method, method, **kwargs):
         async with aiohttp.ClientSession(headers=self.headers) as session: