/**
  * Remove a subscription listener for a specific account.
  * 
  * @global BC_Accounts $bc_accounts
  * 
  * @param string $account_hash
  */
 public static function remove_subscription($account_hash)
 {
     global $bc_accounts;
     // Set up the account to which we're pushing data
     $account = $bc_accounts->set_current_account($account_hash);
     if (false === $account) {
         // Account was invalid, fail
         // Restore our global, default account
         $bc_accounts->restore_default_account();
         return;
     }
     // Get the subscription ID so we can delete it
     $subscription_id = get_option('bc_sub_' . $account_hash);
     if (false !== $subscription_id) {
         // We're in a static method, so instantiate the API we need
         $cms_api = new BC_CMS_API();
         // Unsubscribe from the thing
         $cms_api->remove_subscription($subscription_id);
     }
     // Restore our global, default account
     $bc_accounts->restore_default_account();
 }