I had to estimate the effort for decoding a Base64 encoded message. Honestly A reminder to self (and for others working in the dark spheres of lowest level integration).
Python / WLST
You can easily decode a Base64 message in Python. With WebLogic installed this obviously is working with WLST (also in offline mode). No imports, no nothing, no questions asked:
Online (I am tempted to write PaaS )
For a quick I-need-to-get-this-decoded solution try one of the online services such as
https://www.base64decode.org which is working pretty well for me.