Bulk export job failing with 400 on digital channel metadata

General Discussion
1

Struggling to figure out why the recording export job is failing for our digital channel streams. The standard voice recordings export fine to the S3 bucket, but the digital channel data (WhatsApp, Web Chat) triggers a validation error on the metadata payload.

We are using the Recording API v3.5.2 in the London region. The chain of custody metadata is required for legal discovery, so we cannot skip the custom fields. The job status returns FAILED with the message: Invalid metadata structure for digital channel type.

Here is the JSON payload we are sending in the bulk export request body:

{
 "export_job_id": "exp_job_998877",
 "destination": {
 "type": "S3",
 "bucket": "legal-discovery-eu-west-2",
 "prefix": "digital_channels/2023-10/"
 },
 "filters": {
 "media_type": ["DIGITAL_CHANNEL"],
 "start_time": "2023-10-01T00:00:00Z"
 },
 "metadata_inclusion": {
 "chain_of_custody": true,
 "custom_architect_variables": true,
 "participant_ids": true
 }
}

The S3 integration is verified and working. Is there a specific schema requirement for digital channel metadata that differs from voice? The documentation is vague on this point. Any insight on the correct structure would be appreciated.

2

It depends, but generally…

  • Check the payload structure in your JMeter thread group.
  • Ensure metadata is a flat object, not nested arrays.
  • Verify no null values exist for required chain-of-custody fields.

The platform API rejects malformed JSON structures during bulk exports. Try logging the raw request body to spot syntax errors.

3

The easiest fix here is this is to simplify the payload structure before sending it to the API.

  1. Flatten the metadata object to avoid nested arrays.
  2. Remove any null values from the chain-of-custody fields.

The system validator rejects complex JSON structures during bulk jobs.