feat: pay to address based on acp version

examples/python/servers/fastapi/main.py

@@ -20,18 +20,19 @@
 load_dotenv()
 
 # Get configuration from environment
-ADDRESS = os.getenv("ADDRESS")
+ACP_V1_RECEIVER_ADDRESS = os.getenv("ACP_V1_RECEIVER_ADDRESS")
+ACP_V2_RECEIVER_ADDRESS = os.getenv("ACP_V2_RECEIVER_ADDRESS")
 CDP_API_KEY_ID = os.getenv("CDP_API_KEY_ID")
 CDP_API_KEY_SECRET = os.getenv("CDP_API_KEY_SECRET")
 NETWORK = os.getenv("NETWORK")
 
 print(f"🔍 Loading environment variables:")
-print(f"   ADDRESS: {ADDRESS}")
+print(f"   ADDRESS: {ACP_V1_RECEIVER_ADDRESS}" + f" {ACP_V2_RECEIVER_ADDRESS}")
 print(f"   CDP_API_KEY_ID: {CDP_API_KEY_ID[:20] if CDP_API_KEY_ID else 'NOT SET'}...")
 print(f"   CDP_API_KEY_SECRET: {'SET' if CDP_API_KEY_SECRET else 'NOT SET'} ({len(CDP_API_KEY_SECRET) if CDP_API_KEY_SECRET else 0} chars)")
 
-if not ADDRESS:
-    raise ValueError("Missing required environment variable: ADDRESS")
+if not ACP_V1_RECEIVER_ADDRESS or not ACP_V2_RECEIVER_ADDRESS:
+    raise ValueError("Missing required environment variable: ACP_V1_RECEIVER_ADDRESS or ACP_V2_RECEIVER_ADDRESS")
 if not NETWORK or NETWORK not in ["base", "base-sepolia"]:
     raise ValueError(f"Invalid network: {NETWORK}")
 
@@ -111,12 +112,24 @@ async def dynamic_price_middleware(request: Request, call_next):
     # Read dynamic price from X-Budget header
     budget = request.headers.get("X-Budget", "$0.001")
     print(f"📋 Dynamic budget from header: {budget}")
+
+    # Receiver depends on ACP version
+    acp_version_str = request.headers.get("X-ACP-VERSION", "1")
+    try:
+        acp_version = int(acp_version_str)
+    except ValueError:
+        acp_version = 1
+
+    if acp_version == 2:
+        pay_to_address = ACP_V2_RECEIVER_ADDRESS
+    else:
+        pay_to_address = ACP_V1_RECEIVER_ADDRESS
 
     # Use the standard require_payment middleware with dynamic price
     payment_middleware = require_payment(
         path="/acp-budget",
         price=budget,  # ⭐ dynamic price
-        pay_to_address=ADDRESS,
+        pay_to_address=pay_to_address,
         network=NETWORK,
         facilitator_config=facilitator_config,
         description=f"acp job budget ({budget})",