How do I view past invoices status and the introduction fees paid to me?

You can view this under Invoice History.

To check if a client has completed payment, you can refer to the "Invoice Status" (see second column). Invoices which are still pending payment are marked as "Pending" while the paid ones are marked as "Paid".

Introduction fees that have already been paid out to you will be reflected as “Transferred” under "Payout Status" (see last column).

To view only the introduction fees paid out for a particular month or year, you can type into the search panel accordingly (e.g. Dec 2023 or 2023).