As of 1 November 2018 the EPO will participate in the WIPO Digital Access Service (DAS) for the exchange of certified copies of patent applications concerning priority documents.
The purpose of DAS is to establish a cost- and time-effective electronic system for processing and exchanging priority documents within participating patent offices, by relieving the applicant of the need to submit the documents to the Office of First Filing.
Find further information here.
Source: IPR Helpdesk News
EPO: Priority document exchange through WIPO DAS