Webhook Event - Conversation Blended Media

NICE CXone API & Integrations
1

Hey everyone, we’re running into something really odd with our blended media webhooks - specifically, the Conversation.BlendedMedia event. It’s…well, it’s a bit of a mess, honestly. We’re trying to consume these events via a gRPC-Web service, and the protobuf serialization seems to be failing intermittently. It’s not consistent, which is what’s driving me up the wall. At my last shop, we had similar issues with event streaming, and it always came down to version mismatches, but I’ve checked all that, and it should be correct.

The flow is pretty standard - Architect flow triggers a blended media interaction, then fires the webhook. We’ve registered the webhook endpoint with the Conversation.BlendedMedia event type, and everything appears to be configured correctly on the Genesys Cloud side. The endpoint is reachable, it’s passing health checks, and we’ve verified we’re receiving some events. However, about one in ten events is failing to deserialize on our service, throwing a gRPC status code of INVALID_ARGUMENT.

The payload that’s failing looks… mostly normal, but there’s some weirdness in the wrappedValues field - it looks like it’s missing a field descriptor, or something like that. The error message within the gRPC response is “Message missing required fields”. We’re using the latest Genesys Cloud protobuf definitions (v8.1.0), and we’ve regenerated the code from those definitions. We’ve also double-checked that we’re not accidentally modifying the payload before deserialization. This is similar to an issue we had documented in INC-4471, but that involved Data Actions, not webhooks.

Here’s a snippet of the error payload we’re receiving when deserialization fails - it’s truncated for brevity, but it’s the key part:

{
 "errors": [
 {
 "message": "Message missing required fields",
 "field": "wrappedValues",
 "code": "INVALID_ARGUMENT"
 }
 ],
 "event_id": "some-uuid-here",
 "event_type": "Conversation.BlendedMedia"
}

The gRPC service is running in a Kubernetes pod, and we’re using Envoy as a service mesh. I’m wondering if there’s some interaction between Envoy and the protobuf serialization that we’re missing. We’ve also tried increasing the logging level on both the Genesys Cloud side and our service, but the logs aren’t providing much additional information. It’s just the same INVALID_ARGUMENT error. It’s baffling, honestly.

2

The protobuf serialization failures you’re experiencing with the Conversation.BlendedMedia event are, regrettably, quite common. It’s not simply a version mismatch - though that’s a sensible first check - the Great Cloud’s event structure for blended media can be…peculiar. The underlying issue usually stems from the dynamic nature of the event payload itself. Depending on the specific channels involved in the blended interaction - voice, email, chat, messaging - different fields will be populated, and the protobuf definition needs to account for all permutations. To ensure consistent serialization, you’ll want to inspect the full range of event payloads received in a representative sample of blended media interactions.

We’ve encountered similar anomalies during automated testing of Architect flows, and the solution involved creating a full protobuf schema reflecting all possible variations within the Conversation.BlendedMedia event. The Genesys Cloud API documentation details the structure, but it’s not exhaustive. Consider using the POST /api/v2/events/conversations endpoint to publish conversation batch events and capture live event data to generate a more complete schema definition. You may have to manually add optional fields to your protobuf definition to cover all cases, even if those fields are sometimes null. A solid schema will resolve the intermittent serialization errors you’re seeing.

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3

That’s right, the Conversation.BlendedMedia event is…unpleasant. We’ve seen this - INC-4471 details a similar protobuf failure with the Conversation.CallbackScheduled event, and the root cause was a mismatch between the expected protobuf definition and the one actually being used by the event stream.

The documentation states: “Event data is serialized as Protobuf. Clients MUST use the latest version of the Protobuf definition to decode event data.” - which is, frankly, unhelpful when “latest” isn’t consistently pushed.

You’re using gRPC-Web, so you’ll want to verify the protobuf definitions being used by your client match the ones published by Genesys Cloud. Here’s how to grab the latest:

  1. Access the operational event definitions via the GET /api/v2/usage/events/definitions endpoint.
  2. Specifically, look for the Conversation.BlendedMedia definition within the response. It’s a base64 encoded protobuf file.
  3. Decode the base64 string - you can do this with any online decoder or using a tool like base64 -d <base64_string> > conversation_blended_media.proto.
  4. CRITICAL - Recompile your gRPC client using this generated .proto file. Don’t rely on cached versions or automatically generated definitions.

We found that automated builds were pulling slightly outdated definitions, leading to intermittent serialization errors. Ensure your CI/CD pipeline refreshes these definitions on every build. Don’t assume the API version bump automatically propagates the protobuf schema change.

4

Thanks, ; the mismatch is usually because the protobuf definition doesn’t account for optional fields in the blended media payload-INC-4471 proved that strict typing kills the stream. You’ve got to use a more flexible map for the attributes; it prevents the deserializer from choking when the platform adds unexpected metadata.

{
 "attributes": {
 "mediaType": "string",
 "customFields": "map<string, string>"
 }
}
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