How to update template through PHP Callback?

[bzcomputers]

Building an add-on in which I'm trying to figure out the process of getting an existing template (or creating it if it doesn't exist), update its' contents, resave it, and update the cache. I think that covers the whole process.

Seems my many tries at it have failed. I have searched everywhere for any documentation on this and have found nothing. If anyone could provide a link to some info or a generic sample code it would be appreciated. Thanks.
How to update template through PHP Callback?

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