Incoming invoices you can find in "Incoming", section "Invoices".
Any user of trading platform who knows your email can send you a Invoice. When you get a new Invoice you will get a notification on trading platform and to your email.
You can find your Invoice in section "Incoming"
To accept or reject your Invoice select the "clock" icon in the right corner:
To view the history of incoming Invoices and its current status, select "Incoming" in the "Invoices" section. All incoming Invoices for your profile will be shown there.