OVERVIEW
Perform[cb]'s Conversion API solution is a complete cookie-less tracking solution that maximizes tracking in TikTok. It is just as easy to set up as a regular HTML Javascript pixel, but is not affected by cookie blocking policies of many browsers, such as Safari on iOS, MacOS and Firefox. The API tracks 2.5-3x times more events than the TikTok pixel. We recommend always using the TikTok Conversion API.
TikTok SETUP
To create a TikTok pixel, you must first have or create a TikTok Business Account and an Advertiser Account.

Once you have that setup, you can create pixels
Go to TikTok Ads ManagerNavigate to “Assets - Events” Choose Manage under Web Events sectionClick on Set Up Web EventsFor these purposes, we will setup an Events API (server to server) but you also have the option to select a TikTok Pixel through a web browser

Set Up Events APIManually Set Up Events API

Click 'Setup', then 'Next' To retrieve your Pixel ID:Again, make sure you’re in Ads Manager > Assets > Settings

To retrieve the Access Token:Click into the appropriate PixelGo to SettingsClick on “Generate Access Token”Grab & save your Access Token (this will not be stored by TikTok)

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Sources:
https://ads.tiktok.com/marketing_api/docs?rid=959icq5stjr&id=1727537566862337
https://ads.tiktok.com/i18n/events_manager/v2/creationFlow/eventsAPI/installCode/CAJ22ARC77UDEFJHE1J0/?aadvid=7101985206860611586
PCB SETUP
This is similar to setting up a regular Postback in your Perform[cb] Portal.
In our platform,Go to Tracking Pixels > Add NewDepending on your preference, select Global Pixel, Offer Pixel, Offer Group or Vertical. In most cases, you’ll select a specific offer.Select Fire On “CPA/CPE/CPI/CPS/CPL main conversion”Select Type: “TikTok Events API”Add your Pixel IDAdd your Access TokenEvent Type: select the appropriate conversion point (most cases will be Submit Form)TikTok Click ID. Tell us from where you will be passing the TikTok ClickID. From Referral URL, this only works if you are not using landing pages. If you are using a landing page, then you should capture ttclid parameter on your landing pages and pass it to PCB via one of the subids. Then on this page, select which subid is passed into.
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FAQ
Will this method track 100% of leads in TikTok?
Conversion API will track higher than a regular Pixel because regular pixels depend on cookies, which are blocked by Safari and Firefox, which means it will not work on iPhone devices.
However, even with Conversion API, TikTok is not allowed to track users that opted out of tracking on iOS14.5 or in EU. This is a TikTok limitation and applies to every platform.
Why does the % of tracking fluctuate?
This really depends on % of conversions received from iOS 14.5 users that have opted out of tracking. If your campaign is delivering to mostly iOS 14.5+ users, then you will see higher discrepancy.