From 2016-09-02 the recommended way is to use an SSH key authentication instead of the password authentication.
Mage2.PRO code repository is private, so you need to setup the Composer credentials.
You can do it with an auth.json file.
- How to setup an
auth.jsonfile for the Composer? - How to know your username in the Mage2.PRO repository.
- You have set your own password for the Mage2.PRO repository during registration in the repository: How to register yourself in the code.dmitry-fedyuk.com repository
- How to setup credentials for the
repo.magento.com