Vercel

Functions and builds authenticate as the project and environment they run in.

What proves the identity

The token has to come from https://oidc.vercel.com/acme, and its sub claim has to match the workload you named. penv compares that claim byte for byte, with no wildcards.

Every token also has to name your workspace as its audience. Ask for this audience and no other. A token requested for two audiences fails every exchange.

What the console asks for

A field marked advanced carries a default and stays behind the disclosure until you open it.

The console also asks which project and environment this identity reaches and which role it gets, with the credential lifetime behind Advanced.

What the trust holds

Built from the example answers above:

penv names the identity for you, so the form never asks for one.

The snippet the console prints

// Runs in a build or a function's request handler, never at module scope.
// JavaScript only: a custom audience has no documented HTTP form.
import { getVercelOidcToken } from '@vercel/oidc';

export async function GET() {
  const T = await getVercelOidcToken({ audience: 'YOUR_WORKSPACE_ID' });
  const r = await fetch('https://penv.cloud/api/v1/auth/oidc', {
    method: 'POST',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify({ token: T }),
  });
  process.env.PENV_TOKEN = (await r.json()).credential;
}

Related

• Machine identity
• Connect a Platform in the console
• Vercel documentation, where the value people get wrong is always the subject