/**
 * Called at each change of user subscription state due to a plan activation or deactivation
 *
 * @param  UserTable        $user               The user owning the $subscription with that $planId
 * @param  string           $status             New status: 'A'=Active, 'X'=Expired, 'C'=Cancelled
 * @param  int              $planId             Plan Id which is changing status
 * @param  int              $replacedPlanId     Replaced Plan Id in case of an upgrade
 * @param  ParamsInterface  $integrationParams  Integration parameters for that plan $planId
 * @param  string           $cause              'PaidSubscription' (first activation only), 'SubscriptionActivated' (renewals, cancellation reversals), 'SubscriptionDeactivated', 'Denied'
 * @param  string           $reason             'N' new subscription, 'R' renewal, 'U'=update )
 * @param  int              $now                Unix time
 * @param  cbpaidSomething  $subscription       Subscription/Donation/Merchandise record
 * @param  int              $autorenewed        0: not auto-renewing (manually renewed), 1: automatically renewed (if $reason == 'R')
 * @return void
 */
public function onCPayUserStateChange( $user, $status, $planId, $replacedPlanId, $integrationParams, $cause, $reason, $now, $subscription, $autorenewed )