400 Bad Request: Invalid JSON structure
What is the correct way to pass complex agent scripting variables to ServiceNow via Data Actions? The webhook payload fails validation when nested objects exceed 2KB. Testing from London (UTC+0). The scripting_event trigger sends the payload to https://api.mypurecloud.com/api/v2/integrations/dataactions, but the ServiceNow REST API rejects the schema. Is there a documented size limit for script variable injection?
This looks like a standard case of over-engineering the data payload rather than leveraging the platform’s native orchestration capabilities. The 2KB limit is a hard constraint for many external REST endpoints, and attempting to force complex nested objects through a simple webhook often results in the 400 errors you are seeing. Instead of passing the entire script context, consider using the Architect flow to extract only the essential fields into a flat JSON structure before the Data Action executes. This approach aligns with standard enterprise governance, ensuring that downstream systems like ServiceNow receive predictable, lightweight payloads.
{
"ticket_type": "{{flowData.ticketType}}",
"customer_id": "{{flowData.customerId}}",
"priority": "{{flowData.priorityLevel}}"
}
Flattening the data structure significantly reduces the risk of schema validation failures and improves overall integration reliability.
The quickest way to solve this is…
Cause:
Nested objects exceed the 2KB limit for external REST endpoints.
Solution:
Flatten the JSON structure before the Data Action. Extract only essential fields into a single-level object. This prevents schema rejection by ServiceNow. Validate the payload size in the Architect flow logic.