Invoices are categorized based on statuses. We've got detailed documentation on each of these statuses, but I'll go ahead and summarize them here:

Open status invoices are the status that all invoices start out in. When an appointment gets booked or an invoice is initially created from TimeTap's back office, the status will be either "Open - No Payment" or "Open - Partial Payment" depending on whether the client has submitted any payment toward the invoice balance. Invoice payments and line items can only be added and edited when the invoice is in open status, so if you are looking at a Closed or Void invoice and wondering why you can't make changes to the line items or the payments, just select the more actions menu to reopen the invoice
Closed status invoices are any invoices whose balance has reached $0.00. This could either be because the payments from the client have added up to the invoice total amount or maybe you added a write off amount on the invoice. Either way, once the balance reaches $0.00, the invoice will get marked as closed. Once the invoice is marked as Closed you can no longer make changes to it; you can always reopen the invoice to make changes, but no changes can be made if the invoice is in closed status currently.
Void status invoices are for any invoices where you don't expect to collect on but you still want to maintain a record of them. When you require payment upon booking, then if someone does not pay for an appointment the invoice will be marked as "Void - No Payment". You can also manually void and invoice to put it in this status by using the More Actions dropdown menu from an open status invoice screen.

Click the links above to go to the individual documentation page for each status of invoices.

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