https://www.epo.org/en/service-support/faq/applying-patent/cnipa-epo-pilot-programme/international-search-fee/when-do-i
When do I have to pay the fees for my international application?
Pursuant to Rules 14.1(c), 15.3 and 16.1(f) PCT, all fees must be paid within one month from the date of receipt of the international application at the receiving Office.
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