identified problem with cashu tokens from different mints

router/auth.py

@@ -38,7 +38,7 @@ async def validate_bearer_key(bearer_key: str, session: AsyncSession) -> ApiKey:
             if exsisting_key := await session.get(ApiKey, hashed_key):
                 return exsisting_key
             new_key = ApiKey(hashed_key=hashed_key, balance=0)
-            await credit_balance(bearer_key, new_key, session)
+            await credit_balance(bearer_key, new_key, session) #TODO: see cashu.py "_initialize_wallet"
             await session.refresh(new_key)
             return new_key
         except Exception as e:

router/cashu.py

@@ -13,11 +13,13 @@ MINIMUM_PAYOUT = int(os.environ.get("MINIMUM_PAYOUT", 10))
 DEVS_DONATION_RATE = 0 # 0.021  # 2.1%
 WALLET = None
 
-
+#TODO
+# This causes problems when users send tokens from other mints
+# WALLET is already set so it returns the specified wallet, but this wallet does not know the keyset of the token 
 async def _initialize_wallet(mint_url: str | None = None) -> Wallet:
     """Initializes and loads a Cashu wallet."""
     global WALLET
-    if WALLET is not None:
+    if WALLET is not None and WALLET.mint_url == mint_url: # only return existing wallet if the mint_url matches the one of current WALLET
         return WALLET
     if mint_url is None:
         mint_url = MINT
@@ -121,6 +123,7 @@ async def pay_out(session: AsyncSession) -> None:
 
 async def credit_balance(cashu_token: str, key: ApiKey, session: AsyncSession) -> int:
     token_obj: Token = deserialize_token_from_string(cashu_token)
+    token_mint =  await _initialize_wallet(token_obj.mint)
     wallet: Wallet = await _initialize_wallet(token_obj.mint)
     amount_msats = await _handle_token_receive(wallet, token_obj)
     key.balance += amount_msats