The additional search fee paid in response to an invitation to pay additional fees after a finding of lack of unity (Form PCT/ISA/206, see
GL/PCT‑EPO B‑VII, 6.2) is collected directly by the EPO as International Searching Authority (ISA/EP) and its amount is fixed by the EPO. This fee is to be paid within one month from the date of the invitation. The amount payable is the amount applicable on the date of receipt of the international application.