11.2.2 Payment of designation fee 

All states party to the EPC at the time of filing a European patent application are automatically designated when the application is filed. The designation fee, however, may be paid later (see A‑III, 11.2.1).

Payment of the designation fee covers all contracting states, except those for which the designation has been expressly withdrawn.

Such payment simply needs to be marked "designation fee" in order for the purpose of the payment to be established.