https://www.epo.org/en/node/how-can-i-file-automatic

How can I file an automatic debit order for fees payable in the international phase?

You can do this via EPO Online Filing, PCT-SAFE, CMS or ePCT, using Form PCT/RO/101, Form PCT/IPEA/401 or PCT-SFD, or via Online Fee Payment in Online services. A separate section in these tools allows you to select automatic debiting as your means of payment.

Automatic debit orders can also be filed on paper, by fax or via Webform filing, using Form PCT/RO/101 or PCT/IPEA/401. In such cases, in the fee calculation sheet annexed to Forms PCT/RO/101 and PCT/IPEA/401 you should tick the box marked "other" in the "mode of payment" section, then write "Automatic debiting" in the free-text field provided. Please note that processing delays may occur if automatic debit orders are filed in this way.