Hi Imtiaz Tamim,
To manage credentials on Vapi, you can use OAuth2 authentication, API keys, or custom headers for webhook and custom LLM integrations. For configuring OAuth2, you can follow the [OAuth2 Authentication guide](
https://docs.vapi.ai/server-url/server-authentication) to secure your server endpoints. If you are working with Langfuse, you can create and update credentials on the [Provider Credentials page](
https://dashboard.vapi.ai/keys).
If there's anything specific you need assistance with regarding credential management, feel free to ask.