Translation Management Extension Classes, methods, documentation and/or examples

I am trying to write a Translation Management Extension in Tridion Docs, but running into issues where I need to reference the classes and methods available, I haven't been able to find any documentation on these. The PreTranslation extension included out of the box, doesn't have source code available that I can reference, would anyone be able to offer advice on how to proceed or possibly provide a sample Translation Management Extension? Thanks in advance for your assistance...

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