Duplicate an export template

Creates a deep copy of an export template, including all attributes, analyzer tests, tags, custom form fields, and marketing data. The duplicate receives a (Copy) name suffix and Draft status. The operation runs asynchronously and returns 202 Accepted with a Content-Location header pointing to the operation resource. Poll GET /V2/operations/{operationId} for progress and the result. **Publishing required.** The new export template is a draft. It becomes available in the Productsup platform only after you publish it with `POST /V1/export-templates/{id}/commit`. When the caller is not an internal user, the internal-only tags (`non_billable_channel_type`, `main_channel_type_id`, `category_specific_export_is_parent`) are not copied: the duplicate is billable and of the standard export type.

curl -X POST "https://export-template-api.productsup.com/V2/export-templates/0/duplicate"

{
  "operationId": "01980f10-5b04-7845-b0d5-66861c6cabb0",
  "status": "queued"
}

{
  "errors": {
    "message": "Resource access denied."
  }
}

{
  "errors": {
    "message": "Resource access denied."
  }
}