https://www.epo.org/en/node/what-happens-if-i-file

What happens if I file an automatic debit order on the last day of the time limit for paying a particular fee?

Payment of the fee concerned is considered to have been received on that day.

However, as processing the automatic debit order is likely to take some time, there may be a delay in actually debiting the fee – especially if the order is filed on paper, by fax or by means of Webform Filing.