Kafka stream hitting GC callback URL and getting 400 error code. PII masking policy isn’t redacting emails, audit log shows full address still passing through queue. MuleSoft worker’s just forwarding json payload directly. Transform step disabled in config.
WebhookEvent event = new WebhookEvent();
event.setPayload(jsonString);
client.getWebhooksClient().postEvent(event);
// 400 response: "security validation failed on callback body"
// logs: {"trace": "abc-123", "error": "PII detected in...Are you actually passing the required SECURITY_TOKEN in the request headers before the MuleSoft worker hits the callback endpoint? I always check the INBOUND_WEBHOOK_CONFIG first because the masking policy won’t trigger if the payload structure misses the expected envelope. You can’t just forward raw json without wrapping it properly. It’s a pretty standard devops setup. Don’t overthink the routing rules here.
Switch to the standard /api/v2/webhooks/events endpoint and make sure the WebhooksClient object has the webhooks:write scope attached. Here is how you structure the payload so the PII_MASKING_POLICY actually ches the email fields before it leaves the queue.
curl -X POST "https://api.mypurecloud.com/api/v2/webhooks/events" \
-H "Authorization: Bearer <TOKEN>" \
-H "Content-Type: application/json" \
-d '{
"eventType": "custom:piimask.test",
"payload": {
"contactId": "c-123",
"email": "user@example.com",
"metadata": { "policyId": "pii-mask-default" }
}
}'
Run a quick test against the staging environment first. The audit logs will show the redaction step once the envelope matches. Check the response headers for the rate limit anyway.
Cause:
The 400 response usually points to a schema validation failure before the masking policy even runs. The masking logic is tied to the specific event_type defined in the webhook configuration. If the payload structure doesn’t match that type exactly, or if required fields are missing, the endpoint rejects it. The Java SDK WebhookEvent class often adds extra wrapping that breaks validation. MuleSoft might be dropping the envelope structure the masking policy expects.
Solution:
Verify the event_type in the request body matches the webhook event definition in the admin console. If the SDK is causing issues, bypass it and send a direct HTTP POST to test the payload structure. The masking policy only activates on valid event schemas. In the notification stream, the schema validation happens at the ingress level.
{
"event_type": "routing.queue.member:added",
"data": {
"email": "test@example.com"
}
}
The masking policy applies to the data object. If the structure is wrong, the validation fails. Check the webhook event schema in the docs for the exact fields required. Schema validation is strict. No wiggle room.