Casual bank transfer or, better, regular annual or semi-annual bank transfer, which guarantees you not to forget. Remember to specify your name for the transfer !
The transfer is an order that you give your bank to transfer an amount from your account to that of a beneficiary. The transfer order must indicate the account number to be debited, the amount, the desired execution date, the IBAN code of the beneficiary account and possibly the BIC code. SEPA transfers in euros are free in Europe.