APNS and iOS - is it possible to deploy several certificates to the Apple Push Notification Server?

Question

We are having an app developed for us by a software company. They are telling us that they don't want to store our enterprise APNS certificate, because allegedly this would break the Push Notifications for other customers. Is it true that the developer can have only one certificate to sign their apps?

The app that is being developed is supposed to be published in two ways - for the general audience - via Apple App Store, and internally a branded version of the same app.

Push notifications work well on the official app, but when we distribute the IPA file internally, the app doesn't work. They are telling us that if they used our certificate for APNS, this would would work for us, but not for other customers. Is that correct, or are we misunderstanding how the APNS works?

Answer 1

Is it true that the developer can have only one certificate to sign their apps? - No . Developers can sign apps using different certificate of different account. If you have enterprise account then they will sign app using certificate created using your account.

They are telling us that if they used our certificate for APNS, this would would work for us, but not for other customers. - Generally when we create apps for APNS it will work for everyone. Hence it will possible to work for everyone.