429 Too Many Requests on /api/v2/interactions during JMeter ramp-up

Can anyone clarify the exact rate limit for the /api/v2/interactions POST endpoint when simulating 500 concurrent calls via JMeter 5.6.2? We are hitting 429 Too Many Requests almost immediately after ramping up threads. The error response includes Retry-After: 2, but our script logic isn’t handling the backoff correctly. Here is the payload structure we are using for the initial request.

{
 "type": "conversation",
 "externalContactId": "ext_12345",
 "initialContactType": "voice"
}

Is there a specific header or query parameter we are missing to handle higher throughput?

The root cause here is the platform rejecting requests that exceed the per-minute quota for interaction creation. Ensure your JMeter script respects the Retry-After header and implements exponential backoff to avoid tripping the rate limiter again.