Payment schedules for bonds are not available through Eikon Data APIs. They can be generated using BdCashflows function of AdfinX Analytics library, which is part of Eikon COM APIs. It's possible to use this library in Python, but it's not very straightforward. If you'd like to learn more, see this article. The article does not contain an example of generating a bond payment schedule, but it'll give you a good idea of what's involved in using AdfinX Analytics library in Python.
