This API returns a grouped classification summary for a mixed document. The response organizes detected forms into logical groups, with each group containing its associated pages and metadata such as form type, status, and uniqueness values. This helps you identify which pages belong to which forms and supports use cases such as reviewing form classifications, distinguishing between known forms (e.g., 1040, W2) and UNKNOWN forms, extracting key borrower data (such as SSN or name) via uniqueness_values, and handling scenarios where UNKNOWN forms need to be split into separate groups for processing.