Stuck on a specific edge case while deploying our latest AppFoundry Premium App for automated outreach. The integration handles outbound messaging via the POST /api/v2/conversations/messages/agentless endpoint. We are seeing a surge in 409 Conflict responses when multiple tenants attempt to initiate conversations for the same external contact ID simultaneously.
The error payload looks like this:
{
“code”: “duplicateConversation”,
“message”: “A conversation already exists for this participant”,
“status”: 409,
“details”: “Cannot create new conversation when an active session exists for user: +15550199888”
}
Our current retry logic waits 5 seconds and retries, but this creates a bottleneck during peak loads in the US West region. The documentation suggests checking for existing conversations, but polling for active sessions by participant ID adds significant latency to the flow. Is there a more efficient way to handle idempotency keys or detect active sessions without a full lookup? We need to ensure no messages are dropped while keeping the API call count within our rate limits.