How do I set up a stock music download site

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I've done quite a bit of coding, and I'm also a music composer, and I'd like to set up my catalog online for download.

After looking around, it looks like stock music sites might be coded from scratch or using a framework, or maybe customizing an existing audio hosting platform....

I know a lot of C++, I've done some PHP and MySQL in the past, and bits of other languages. I'm ready to learn whatever I need to. I just need to know what that is.

Anybody know how stock music download sites are typically set up?

Thanks in advance.

What I have tried:

I've visited a dozen stock music sites, looking for a "Powered by" line at the bottom, to get some sort of hint of how the sites are set up. No luck there.

I visited every audio hosting site I could find, but none of them look like, or have the features that the stock music sites have (like posting a watermarked file, but downloading an un-watermarked file). Also, they're branded (ex: bandcamp).