Updating the heygen examples to use sandbox by default.

examples/foundational/43-heygen-transport.py

@@ -25,6 +25,7 @@ from pipecat.processors.aggregators.llm_response_universal import (
 from pipecat.services.cartesia.tts import CartesiaTTSService
 from pipecat.services.deepgram.stt import DeepgramSTTService
 from pipecat.services.google.llm import GoogleLLMService
+from pipecat.services.heygen.api_liveavatar import LiveAvatarNewSessionRequest
 from pipecat.transports.heygen.transport import HeyGenParams, HeyGenTransport, ServiceType
 
 load_dotenv(override=True)
@@ -43,6 +44,12 @@ async def main():
                 audio_in_enabled=True,
                 audio_out_enabled=True,
             ),
+            session_request=LiveAvatarNewSessionRequest(
+                is_sandbox=True,
+                # Sandbox mode only works with this specific avatar
+                # https://docs.liveavatar.com/docs/developing-in-sandbox-mode#sandbox-mode-behaviors
+                avatar_id="dd73ea75-1218-4ef3-92ce-606d5f7fbc0a",
+            ),
         )
 
         stt = DeepgramSTTService(api_key=os.getenv("DEEPGRAM_API_KEY"))