curl -X POST "https://api.nedzo.ai/v1/workspaces/19c3b12f-ec54-43ad-8686-00e921f1befd/billing/payment-methods/setup-intent" \
    -H "Authorization: Bearer YOUR_API_KEY"

{
  "clientSecret": "seti_1234567890_secret_abc123",
  "customerId": "cus_1234567890abcdef"
}