I made an API that will generate the correct TikTok signature so that people can use their API directly. The signature is available in their js but it is highly obfuscated and a pain to work with. You can get the correct signature needed by using this tiktok dot pushshift dot io
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Pass the tiktok API url for which you need a signature made using the url parameter (make sure to url encode the tiktok URL).
You can make hundreds of calls a second -- I don't care, I have the bandwidth.