feat(mint): Add Spark L2 wallet backend

.env.example

@@ -63,10 +63,8 @@ MINT_DATABASE=data/mint
 
 # Funding source backends
 # Set one funding source backend for each unit
-# Supported: FakeWallet, LndRestWallet, LndRPCWallet, CLNRestWallet, BlinkWallet, LNbitsWallet, StrikeWallet, CoreLightningRestWallet (deprecated)
-
+# Available backends: FakeWallet, LNbitsWallet, StrikeWallet, BlinkWallet, CoreLightningRestWallet, LndRestWallet, LndRPCWallet, SparkL2Wallet
 MINT_BACKEND_BOLT11_SAT=FakeWallet
-# Only works if a usd derivation path is set
 # MINT_BACKEND_BOLT11_USD=FakeWallet
 # MINT_BACKEND_BOLT11_EUR=FakeWallet
 
@@ -111,6 +109,11 @@ MINT_BLINK_KEY=blink_abcdefgh
 # Use with StrikeWallet for BTC, USD, and EUR
 MINT_STRIKE_KEY=ABC123
 
+# Use with SparkL2Wallet
+# MINT_SPARK_NETWORK="TESTNET" # or "MAINNET", "REGTEST"
+# MINT_SPARK_API_KEY="your_api_key"
+# MINT_SPARK_MNEMONIC="abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
+
 # fee to reserve in percent of the amount
 LIGHTNING_FEE_PERCENT=1.0
 # minimum fee to reserve

cashu/core/settings.py

@@ -116,6 +116,10 @@ class MintBackends(MintSettings):
     mint_strike_key: Optional[str] = Field(default=None)
     mint_blink_key: Optional[str] = Field(default=None)
 
+    mint_spark_network: str = Field(default="TESTNET")
+    mint_spark_api_key: Optional[str] = Field(default=None)
+    mint_spark_mnemonic: Optional[str] = Field(default=None)
+
 
 class MintLimits(MintSettings):
     mint_rate_limit: bool = Field(

cashu/lightning/__init__.py

@@ -7,6 +7,7 @@
 from .lnbits import LNbitsWallet  # noqa: F401
 from .lnd_grpc.lnd_grpc import LndRPCWallet  # noqa: F401
 from .lndrest import LndRestWallet  # noqa: F401
+from .sparkl2 import SparkL2Wallet  # noqa: F401
 from .strike import StrikeWallet  # noqa: F401
 
 backend_settings = [