What happens if I don’t pay the publication fee or file a translation with the national office on time?

https://www.epo.org/en/service-support/faq/applying-patent/validation-system/what-happens-if-i-dont-pay-publication-fee-or

What happens if I don’t pay the publication fee or file a translation with the national office on time?

If the deadline is missed, the translation may still be filed within an additional three months, provided that a 100% surcharge on the publication fee is paid. However, if the requirements are not met within this additional time limit, the patent is deemed to have never existed in the validation state.