Platform API 429 on Bulk User Provisioning

Looking for advice on handling rate limits during bulk user creation.

We are hitting 429 errors consistently when pushing more than 500 users via the POST /api/v2/users endpoint.

{
 "code": "tooManyRequests",
 "message": "Rate limit exceeded"
}

Is there a specific header to adjust or a backoff strategy recommended for AppFoundry integrations?