You will receive an order confirmation email with the email subject :
<UNIQLO Indonesia> Your Order Was Received.
If you do not receive an email in your inbox, please check your spam/junk email.
Furthermore, if you have completed payment, you can know payment status by following these steps:
Open UNIQLO Website/apps > Membership > Order History > Detail
Return & Exchange
Online Orders & Payments
Membership / Coupon