How to buils apps for stores (Android and iOS)?

Good morning friends, I have a question about building applications for Google Play Store and Apple Store. Is it necessary to insert the developer credentials of each store during the App building process? or the credentials are necessary prior to uploading the applications to the stores?

By default (there’s ways to automate this, as well), you’ll need to login to your Apple developer account before creating a distribution (aka store) build of your iOS app on EAS Build. This is because the build process creates or uses certs/ provisioning profiles on your Apple developer account. For Android, this is not necessary; all interaction with the Play Store happens during upload/ submission.