update

backend/app/smartlead_client.py

@@ -180,7 +180,7 @@ class SmartleadClient:
             delay_days = 0 if i == 1 else 2
             
             sequences.append({
-                "step": i,
+                "seq_number": i,  # Required by Smartlead API (not "step")
                 "subject": f"{{{{subject_{i}}}}}",  # Double braces escape to produce {{subject_1}}, etc.
                 "email_body": f"Hi {{{{first_name}}}},\n\n{{{{body_{i}}}}}\n\n",  # Produces: Hi {{first_name}},\n\n{{body_1}}\n\n
                 "seq_delay_details": {