You can go to the "History" menu on the sidebar and download the report. 
1. Filter the date based on your monthly invoice period 
2. To create a report, select the entries you want by clicking the checkboxes. This selection can be done in several ways: 
a. Click "Select all" to download a report of all trips, or 
b. Click on the checkbox to select specific trips 
3. Once you've made the selection, click "Download details". The report will be downloaded in .csv format