Establish connectivity between your notification server and the Apple Push Notification service sandbox environment." A separate certificate " is required
for each app you develop!!!
带推送服务的证书的申请与不带此服务要多申请一个SSL证书,这个证书的申请下来事为了在钥匙串中导出.p12文件放在我们自己的服务器端(Provider)使用.