Update create_exchange endpoint to accept and validate bitcoin_transfer_method

backend/routes/exchange.py

@@ -14,6 +14,7 @@ from database import get_db
 from date_validation import validate_date_in_range
 from models import (
     Availability,
+    BitcoinTransferMethod,
     Exchange,
     ExchangeStatus,
     Permission,
@@ -385,6 +386,18 @@ async def create_exchange(
             detail=f"Invalid direction: {request.direction}. Must be 'buy' or 'sell'.",
         ) from None
 
+    # Validate bitcoin transfer method
+    try:
+        bitcoin_transfer_method = BitcoinTransferMethod(request.bitcoin_transfer_method)
+    except ValueError:
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                f"Invalid bitcoin_transfer_method: {request.bitcoin_transfer_method}. "
+                "Must be 'onchain' or 'lightning'."
+            ),
+        ) from None
+
     # Validate EUR amount
     if request.eur_amount < EUR_TRADE_MIN * 100:
         raise HTTPException(
@@ -468,6 +481,7 @@ async def create_exchange(
         slot_start=request.slot_start,
         slot_end=slot_end_dt,
         direction=direction,
+        bitcoin_transfer_method=bitcoin_transfer_method,
         eur_amount=request.eur_amount,
         sats_amount=sats_amount,
         market_price_eur=market_price,