Preview the result of applying bulk changes to one or more advertisers without actually persisting them. This is a dry-run endpoint that returns what each advertiser’s field would change to, any validation errors, and the current value of each field.
Use this to validate changes before calling the apply endpoint. The response includes a changes array showing the before/after for each advertiser, and a resource_errors array for any IDs that could not be processed.
Each field to change requires a field_type, a field_value (whose type depends on the field), and an operator that controls how the value is applied.
The Everflow API key generated from the Control Center > Security.