The payment application on the Xiaomi Watch S1 Pro is Mi Pay. This is the Xiaomi payment service. Please feel free to use it.
Regarding Mi Pay specifically on the Xiaomi Watch, here are some key points:
1. Mi Pay can be integrated with Xiaomi smartwatches that support NFC (Near Field Communication). NFC-enabled watches allow you to make payments by tapping your watch on compatible payment terminals;
2. You can add your payment cards (credit, debit, or prepaid cards) to Mi Pay on your Xiaomi Watch;
3. Mi Pay's availability on specific Xiaomi Watch models varies by region and the watch's NFC capabilities. Not all Xiaomi smartwatches support Mi Pay, depending on their hardware specifications.