Need some help troubleshooting unexpected 429 Too Many Requests errors when importing large contact lists via the Outbound API.
We are deploying a high-volume dialer integration through AppFoundry and hitting rate limits on POST /api/v2/outbound/contacts during batch imports. The service account has the outbound:contact:write permission and we are using the standard OAuth2 flow for multi-org access. Despite spacing requests at 100ms intervals, the gateway returns 429 responses after approximately 500 records. The error payload indicates a burst limit violation rather than a sustained rate limit. Is there a specific burst allowance for contact imports in the outbound module, or should we be implementing a different pagination strategy for bulk operations? Our current implementation uses the platform API v2 endpoints directly without the SDK abstraction layer.