src/Service/UserService.php
public function confirmEmail($token)
    {
        /* @var $user UserInterface */
        $user = $this->getMapper()->findOneBy(['registrationToken' => $token]);
        if (!$user instanceof UserInterface) {
            return;
        }

        $eventManager = $this->getEventManager();
        $eventManager->trigger(__METHOD__, $this, $user);

        $user->setRegistrationToken($this->getRegistrationToken());
        $user->setEmailConfirmed(true);
        $this->getMapper()->update($user)->save();

        $eventManager->trigger(__METHOD__ . '.post', $this, $user);

        return $user;
    }
public function confirmEmail($token)
    {
        /* @var $user UserInterface */
        $user = $this->getMapper()->findOneBy(['registrationToken' => $token]);
        if (!$user instanceof UserInterface) {
            return;
        }

        $eventManager = $this->getEventManager();
        $eventManager->trigger(__METHOD__, $this, $user);

        $user->setRegistrationToken($this->getRegistrationToken());
        $user->setEmailConfirmed(true);
        $this->getMapper()->update($user)->save();

        $eventManager->trigger(__METHOD__ . '.post', $this, $user);

        return $user;
    }
Confirm user email

@param string $token
@return UserInterface|void