I just received an email from Apple telling me that my "Apple Push Notification Service Certificate will expire".
Please note that iOS pushes will no longer be sent for this application until the certificate is renewed.
Generally, you can simply go to the Apple Developer Portal, create a new push certificate and upload it to Pushwoosh (you don't have to rebuild or update the application).
You can find the details of how to create a push certificate in our iOS configuration guide:
Moreover, you can use our Auto-Configuration Tool in order to renew your certificate:
Note that any existing APNs certificates for this Apple App ID will be revoked during Auto Configuration!