On the details page of each document, you will find a history of all changes that users registered in the company account on online-billing-service.com made on that document.

Thus, from the invoice view page, right-bottom corner you can see:

– when the invoice was created and by whom (if multiple users are registered on the account);

– when and how many times it has been modified

– when it was issued

– you can click on the client’s name to find out details about it