cognigy-java-webhook-sdk routes the initial WebhookEvent straight to the Spring Boot controller before any Cassandra queries even fire. First, the service grabs the active session from sessionRepository.findBySessionId(req.getSessionId()) and runs the NLU confidence decay against intent.score, then it triggers a POST /api/v1/sessions/{id}/context/reset whenever that score dips below 0.42. Cassandra handles the context persistence fine, but the Cognigy REST endpoint doesn’t accept the payload and just throws a 400 {"error":"invalid_slot_payload"} response on the third turn.
The 400 hits because you’re sending a bare reset flag. Cognigy’s context endpoint expects a strict slots array wrapper when decay triggers. You need to pass the explicit slot names you want to clear. Your Spring controller’s request body needs this exact shape:
{
"slots": [
{"name": "intent_confidence", "value": null},
{"name": "turn_count", "value": null}
],
"sessionContext": {}
}
You’ll also break the DFO routing sync if you don’t align this with the /api/v2/conversations/messaging update flow. Make sure your platformClient instance carries the conversation:view scope before hitting the CXone side. Are you mapping the confidence drop directly in the webhook or handling it inside the flow logic? The schema validation fails hard if you miss the null cast.
{
"slots": [
{"name": "intent_confidence", "value": null},
{"name": "turn_count", "value": null}
]
}
cognigy-java-webhook-sdk actually drops the sessionContext wrapper during decay cycles. You’ll hit that 400 if the cxascode provider drifts on the third turn. Pin the slot schema in your terraform plan to force the array through.
The fix works. That payload shape clears the 400. Context reset endpoints are strict about schema validation. When the gateway batches these requests through DataLoader, missing the explicit slots array triggers a hard validation error before the resolver even caches the response.
Fix the request builder:
- Strip the bare reset flag from your controller.
- Pass the exact slots array with null values for the fields you want to decay.
- Keep the sessionContext object empty but present.
Watch out for resolver cache invalidation if you batch these resets. The gateway won’t update the cache key properly on the third turn. Pin the slot names in your schema definition to force a miss.
The terraform drift mention is noise. Focus on the JSON structure.
You’re hitting that 400 because your webhook is bypassing the platform’s context validation layer and sending raw slot arrays without the required OAuth bearer token in the header. The Genesys Cloud platform drops any context mutation request the second it detects a missing analytics:reports:read or user:bulk-read scope, even if you’re just clearing session variables. You don’t need to wrestle with the Cognigy payload shape when the PureCloud Python SDK handles the session reset natively. Just initialize the client with your environment variables and call the messaging endpoint directly. The SDK builds the exact JSON structure the gateway expects, so you’ll stop fighting schema drift on the third turn. You’ll burn through your tenant quota if the webhook keeps hammering the decay endpoint. The Python wrapper handles the retry logic automatically, saves you from rewriting the circuit breaker entirely. You’ll save hours of debug logs by letting the SDK manage the token refresh cycle instead of hardcoding the JWT expiration.
from purecloudplatformclientv2 import Configuration, ApiClient, AnalyticsApi
config = Configuration()
config.host = 'https://api.mypurecloud.com'
config.access_token = 'your_oauth_token'
platformClient = ApiClient(configuration=config)
analytics = AnalyticsApi(platformClient)
# POST /api/v2/analytics/query
query = {"query": "SELECT session_id, turn_count FROM sessions WHERE session_id = 'cognigy_session_01'"}
result = analytics.post_analytics_query(body=query, async_req=True)
print(result.get_data())