It is happening again
For anyone that's still playing this:
Link: https://www.konami.com/games/eu/en/topics/13615/The online service for Pro Evolution Soccer 2015 will be terminated on 25/08/2016 4:00 (UTC). We would like to thank you for your loyal support.
Please note that all of your myClub coins or GP within the game will be invalidated at the same time as the termination of Online service. If you still have left myClub coins or GP, please spend them until the termination of Online service.
We would also like to thank you for your continued support of the PES series titles.