I send you a secure link from GoCardless, the Direct Debit provider I use. You enter your bank details once and approve the Direct Debit online. The link shows your plan, the monthly price and the day you will be billed. After that, payments are collected automatically, so there are no invoices to remember.
It is a standard UK Direct Debit, covered by the Direct Debit Guarantee. GoCardless emails you three working days before each payment, and if a payment is ever taken in error, you are entitled to an immediate refund from your bank.
GoCardless is authorised by the Financial Conduct Authority and holds the money it collects in separate client accounts before paying it to me. I can see the name of your bank and the last two digits of your account number, but not your full bank details. Payments may appear on your bank statement as GoCardless Ltd.
You can cancel a Direct Debit with your bank at any time, but this does not end your plan, so the minimum term still applies.