docs/socialaccount/providers/tiktok.rst
If your app is still in testing/development please complete the Integration Assessment for Unreleased Apps instead, and submit it to be reviewed by our team.
How to Submit a Integration Assessment for Unreleased App:
Development callback URL
TikTok only support https callback url, so you need to use ngrok to create a https tunnel to your localhost. In addition, the url needs to be fixed (paid) because it is taked into account by TikTok after submission and upon validation by TikTok.