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

{
  "portal_url": "https://billing.stripe.com/p/session/..."
}
The billing portal allows users to update payment methods, view invoices, and manage their subscription. Redirect the user to the returned portal_url.