TikTok API:
Post Videos Programmatically

import requests

# OAuth 2.0 access token for the creator (scope: video.publish)
ACCESS_TOKEN = "act.example..."

# Step 1: initialize a Direct Post.
# PULL_FROM_URL: TikTok fetches the file from a domain you verified in the dev portal.
init = requests.post(
    "https://open.tiktokapis.com/v2/post/publish/video/init/",
    headers={
        "Authorization": f"Bearer {ACCESS_TOKEN}",
        "Content-Type": "application/json; charset=UTF-8",
    },
    json={
        "post_info": {
            "title": "Posted with the Content Posting API #fyp",
            # Unaudited apps are forced to SELF_ONLY. Use PUBLIC_TO_EVERYONE
            # once your client passes TikTok's audit.
            "privacy_level": "SELF_ONLY",
            "disable_comment": False,
            "disable_duet": False,
            "disable_stitch": False,
        },
        "source_info": {
            "source": "PULL_FROM_URL",
            "video_url": "https://your-verified-domain.com/clip.mp4",
        },
    },
)
publish_id = init.json()["data"]["publish_id"]

# Step 2: poll until the post is published or fails.
status = requests.post(
    "https://open.tiktokapis.com/v2/post/publish/status/fetch/",
    headers={
        "Authorization": f"Bearer {ACCESS_TOKEN}",
        "Content-Type": "application/json; charset=UTF-8",
    },
    json={"publish_id": publish_id},
)
print(status.json())  # {"data": {"status": "PUBLISH_COMPLETE", ...}}

# FILE_UPLOAD: send the bytes yourself instead of a URL.
# The response returns an upload_url to PUT chunks to.
curl -X POST 'https://open.tiktokapis.com/v2/post/publish/video/init/' \
  -H 'Authorization: Bearer {access_token}' \
  -H 'Content-Type: application/json; charset=UTF-8' \
  -d '{
    "post_info": { "title": "demo", "privacy_level": "SELF_ONLY" },
    "source_info": {
      "source": "FILE_UPLOAD",
      "video_size": 4612443,
      "chunk_size": 4612443,
      "total_chunk_count": 1
    }
  }'
# Chunk rules: 5MB-64MB per chunk (final up to 128MB), <=1000 chunks.
# A file under 5MB must be sent as one chunk.