Fast in, and nothing comes back out
Both sides report changes immediately, so the thing to understand here is which way data can travel.
Neither platform on this pair sits behind a timer. TikTok Shop and QuickBooks both push changes to us as they happen, so a sale is written up without waiting to be noticed. That removes the usual worry about lag and leaves a more important one: QuickBooks takes orders in and never hands them out. Nothing you do in the company file will produce a TikTok Shop order or a TikTok Shop listing.
That is how accounting software is built rather than a feature we have not finished. QuickBooks holds no listings, no photos and no variants, and the number we write against an item there is for reporting rather than for anybody browsing. It is your figure and your accountant’s. If the plan was to run the catalogue out of the company file, this is the wrong shape for it, and better known on day one.