https://www.epo.org/en/service-support/faq/applying-patent/validation-system/what-are-fees-validating-european-patent
What are the fees for validating a European patent?
At the application stage: In addition to the schedule of fees that applies to all applications to the EPO, applicants wishing to validate their patent application outside of the EPC contracting states are required to pay a validation fee for each validation state in which they would like to seek protection. Current validation fees are available in the EPO schedule of fees.
After EP grant: Applicants are also responsible for paying applicable national fees after EP grant, such as publication fees and renewal fees paid directly to the national office of the validation state.