The path to set up USDT auto top-up is as follows.
* PC web
[More services] - [Recurring Buy] - [Select 'In-progress Recurring Buy order' in Recurring Buy history] - [Bottom 'Set USDT auto top-up'] - [2-channel authentication]
* Mobile app
[More] - [Recurring Buy] - [Select 'In-progress Recurring Buy order' in Recurring Buy history] - ['⚙️' at the top right of the Recurring Buy details] - [USDT auto top-up] - [2-channel authentication]
※ This feature can be set for each automatic order.