curl -X POST "https://api.adrelay.dev/v1/billing/portal" \
  -H "X-API-Key: $ADRELAY_API_KEY"

const response = await fetch("https://api.adrelay.dev/v1/billing/portal", {
  method: "POST",
  headers: { "X-API-Key": process.env.ADRELAY_API_KEY },
});

const data = await response.json();
// Redirect user to data.portal_url

import requests

response = requests.post(
    "https://api.adrelay.dev/v1/billing/portal",
    headers={"X-API-Key": "your-api-key-here"},
)

data = response.json()
# Redirect user to data["portal_url"]

{
  "portal_url": "https://billing.stripe.com/p/session/..."
}

{
  "error": "Invalid or missing API key.",
  "code": "UNAUTHORIZED",
  "timestamp": 1711036800,
  "request_id": "req_abc123"
}