I want to pass to my API during the workflow the call id of the vapi call. In this way I can connect the two together for auditing later on. Is there an internal variable I can use for this?

Hi Jonathan Carter, Yes, you can access the call ID in several ways:** 1. Through Server URL Webhooks: - The call ID is included in webhook events sent to your server URL - Available in the event payload:

{
  "type": "call-started",
  "callId": "abc123xyz",
  "timestamp": "2025-09-15T10:00:00Z"
}

2. Using Customer Metadata: - You can pass the call ID in webhook responses using

{{call.id}}

- Include it in your server responses or messages 3. In End-of-Call Reports:

{  "message": {    "type": "end-of-call-report",    "call": {      "id": "abc123xyz",      // other call details    }  }}

To use the call ID in your workflow: 1. Configure your server URL to receive webhooks 2. Access the call ID from the event payload 3. Use it in your API calls for auditing

Great , but when I call an API during the workflow, how do I then pass that same call.id through so I can tie it back together on my server.

In the body of your API request payload, use the dynamic variable

{{call.id}}

to pass it through to your server. Please try using that variable and let us know if you have trouble with it

I set it up like this but on the server I get {{call.id}} , therefore the variable is not available. https://cdn.discordapp.com/attachments/1416050342642057357/1419069453240635505/image.png?ex=68d06aea&is=68cf196a&hm=e591a8cb0c26b1b74973ff9e04f3ec744589870f4f6fef62a40d9a96e2d9c414&

Could you please send a call id where it shows as just {{call.id}} as plain text in the logs?

Hi Jonathan, did you resolve this? Thank you.