1) After customer clicks through the bank transfer module, display a
form at the final page for the customer to enter payment details.
The form should post the collected form data to that particular customer's messages in backend and also to a specified email account.
2) Make this form accessible on the frontend as well (e.g. banner or
placeholder on home page) to allow customers to submit payment
details even after they have closed the page in (1).
please refer to attached sample screenshot.