### Answer When you switch between agent versions, each version maintains its own independent configuration, including the

post_chat_analysis_data

settings. [(1) ]() Here are the most likely reasons post chat data extraction stopped working after switching from version 0 to version 2: 1. **Different

post_chat_analysis_data

configuration**: Each version stores its own

post_chat_analysis_data

array. Version 2 may not have the same extraction fields configured as version 0. 2. **Response engine version mismatch**: The

response_engine

object includes a

version

field that ties to a specific Retell LLM version. If version 2 of your agent points to a different LLM version, the extraction behavior may differ. 3. **Webhook configuration differences**: Each version can have different

webhook_url

and

webhook_events

settings. Ensure version 2 has

chat_analyzed

included in

webhook_events

if you're relying on webhooks for post-chat analysis. To troubleshoot: - Use the Get Chat Agent Versions endpoint to compare the

post_chat_analysis_data

,

post_chat_analysis_model

, and

webhook_events

fields between version 0 and version 2. - Verify the

response_engine.version

matches the LLM configuration you expect. You can retrieve all versions with:

javascript
const chatAgentResponses = await client.chatAgent.getVersions('YOUR_AGENT_ID') ;
console.log(chatAgentResponses) ;

Compare the configurations side-by-side to identify what's different in version 2.

​ To learn more, see the sources I considered: [[1] Get Chat Agent Versions](https://docs.retellai.com/api-references/get-chat-agent-versions) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer --- It looks like you're following up on the previous answer. Is there something specific you'd like me to clarify or help with further regarding the post chat data extraction issue when switching agent versions? If you're still experiencing the problem, here are a few next steps you could try: 1. Compare version configurations using the Get Chat Agent Versions API to see exactly what differs between version 0 and version 2 [(1) ]() 2. Check these specific fields in both versions: -

post_chat_analysis_data

— the extraction fields defined -

post_chat_analysis_model

— the model used for analysis -

webhook_events

— ensure

chat_analyzed

is included if using webhooks 3. Retrieve a specific version using the optional

version

query parameter with the Get Chat Agent endpoint to inspect version 2 directly [(2) ]() Let me know what specific aspect you'd like help with, and I can dig deeper.

​ To learn more, see the sources I considered: [[1] Get Chat Agent Versions](https://docs.retellai.com/api-references/get-chat-agent-versions) [[2] Get Chat Agent](https://docs.retellai.com/api-references/get-chat-agent) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.