[Druid] if the conference fee refundable?

Dear organizers, It’s my honor that I have the opportunity of oral presentation. May I ask whether the conference fee is refundable if I do not get Spain visa? I’m not sure if I can get a Spain visa before the DRUID, because it will take a long time. My Paper ID: 69767 , Paper title: " International collaboration pay-offs from international academic mobility: from the perspective of length-width-depth “ Ying Zhang