add currency env var

.env.example

@@ -47,3 +47,4 @@ ONION_URL="XXX.onion"
 RELAYS="wss://relay.damus.io,wss://relay.primal.net,wss://relay.snort.social,wss://relay.nostr.band"
 CASHU_MINTS="https://mint.minibits.cash/Bitcoin,https://mint.cubabitcoin.org"
 
+CURRENCY = ""

router/cashu.py

@@ -1,8 +1,10 @@
 import asyncio
 import os
 import time
+from typing import cast
 
 from sixty_nuts import Wallet
+from sixty_nuts.mint import CurrencyUnit
 from sqlmodel import col, func, select, update
 
 from .db import ApiKey, AsyncSession, get_session
@@ -15,13 +17,14 @@ PAYOUT_INTERVAL = int(os.environ.get("PAYOUT_INTERVAL", 300))  # Default 5 minut
 DEV_LN_ADDRESS = "routstr@minibits.cash"
 DEVS_DONATION_RATE = float(os.environ.get("DEVS_DONATION_RATE", 0.021))  # 2.1%
 NSEC = os.environ["NSEC"]  # Nostr private key for the wallet
+CURRENCY = cast(CurrencyUnit, os.environ.get("CURRENCY", "sat"))
 
 WALLET: Wallet | None = None
 
 
 async def init_wallet() -> None:
     global WALLET
-    WALLET = await Wallet.create(nsec=NSEC, mint_urls=[MINT], currency="msat")
+    WALLET = await Wallet.create(nsec=NSEC, mint_urls=[MINT], currency=CURRENCY)
 
 
 def wallet() -> Wallet: