The authority with which the application is filed – either the EPO (Munich, The Hague or Berlin) or the competent national authority – must mark the documents making up the application with the date of receipt and issue a receipt to the applicant. The receipt must be issued without delay and include at least the application number, the nature and number of the documents and the date of their receipt. The receipt should also include the applicant's or representative's file reference number or any other information which would be helpful in identifying the applicant. The receipt of European patent applications filed online will be acknowledged electronically during the submission session. Where it becomes apparent that such acknowledgment was not successfully transmitted, the authority with which the application is filed will promptly transmit the acknowledgment by other means where the necessary indications furnished to it so permit (see Art. 13 11 of the Decision of the President of the EPO dated 14 May 2021, OJ EPO 2021, A42 9 May 2018, OJ EPO 2018, A45). The EPO will in principle no longer issue an acknowledgement of receipt by fax (see the Decision of the President dated 20 February 2019, OJ EPO 2019, A18, and the Notice from the EPO dated 20 February 2019, OJ EPO 2019, A15). If still requested under exceptional circumstances, e.g. non-availability of the EPO's electronic filing tools, the service will be provided free of charge.