FinancialService.bulkTransactionOperation() applies approve/reject/reverse to existing transactions (1–100 ids). reverse posts a compensating transaction linked to the original via related_transaction_id, recomputes the running balance, and syncs the client credit balance for credit-type transactions. Returns per-id results { total_requested, successful, failed, results[] }.
Content type: application/json · schema FinancialBulkTransactionOperationBody
approverejectvoidSuccess response 200 · schema FinancialInvoiceApiSuccess