WHMCS Module for Export Invoics in CSV Format

We are looking for an experienced developer for WHMCS modules. The aim is to have an additional entry in the backend which allows the export of invoice data in DATEV-CSV format. Basically, the module only needs to execute an existing SQL command and save the result in a CSV file. The period to be exported for the evaluation must be configurable via two date fields. The CSV files exported so far are displayed in a clearly organised list. The name for the created export can be entered in a text field.