Login link: http://ads.tiktok.com
How to log into your account bypassing SMS verification:
Login/password here - https://ads.tiktok.com/marketing_api/docs
Then you can go to https://business.tiktok.com/
Prepay- first you need to replenish your account - then you can advertise.
Postpay - first you can do advertising - then replenishment of money.
It is easier to add a bank card to Prepay- more difficult to Postpay.