Hi duongthuyvy1995,
Thanks for your inquiry.
The payment is a one-time charge. But kindly note that our license is based on one year subscription. The 1-year subscription enables free priority support and updates for one year, after the subscription expires, you can still use the licensed version of the product, but the new releases and hotfixes are no longer available.
Any other question about purchase, you could contact our sales team(
sales@e-iceblue.com).
Sincerely,
Betsy
E-iceblue support team