update env.example, remove mean comment about the hmac auth token

.env.example

@@ -106,6 +106,13 @@ MINT_BLINK_KEY=blink_abcdefgh
 # Use with StrikeWallet for BTC, USD, and EUR
 MINT_STRIKE_KEY=ABC123
 
+# Use with LNMarketsWallet for USD
+# you can also specify paths from which `ACCESS_KEY`, `SECRET` and `PASSPHRASE` will be read
+MINT_LNMARKETS_REST_URL="https://api.lnmarkets.com"
+MINT_LNMARKETS_REST_ACCESS_KEY="<YOUR_API_ACCESS_KEY>"
+MINT_LNMARKETS_REST_SECRET="<YOUR_API_SECRET>"
+MINT_LNMARKETS_REST_PASSPHRASE="<YOUR_API_PASSPHRASE>"
+
 # fee to reserve in percent of the amount
 LIGHTNING_FEE_PERCENT=1.0
 # minimum fee to reserve

cashu/lightning/lnmarkets.py

@@ -149,8 +149,7 @@ async def create_invoice(
         data = None
         path = None
         if self.unit == Unit.usd:
-            # The ""signature"" of LNMarkets is the sketchiest thing I have ever seen.
-            # I don't know who came up with that. Anyway, we do this trick to avoid messing it up.
+            # We do this trick to avoid messing it up.
             amount_usd = float(amount.to_float_string())
             amount_usd = int(amount_usd) if float(int(amount_usd)) == amount_usd else amount_usd
             data = {"amount": amount_usd, "currency": "usd"}