Three steps, about twenty minutes.
Open Settings, choose Bank connections, pick your bank. You will be sent to the bank to approve read-only access. Transactions from the last 90 days arrive within a minute.
Upload a CSV with name, email and address columns, or paste from a spreadsheet. Duplicates are merged by email.
Invoices → New → pick a contact → add lines → SendThe invoice carries a pay-now link. When the payment lands in the bank feed, it matches on its own and the invoice is marked paid.