How can I get subscription for one month only?

If you wish to subscribe to Sentinel Hub for one month only, go to the Sentinel Hub Dashboard under the Plans tab, select the plan you wish to subscribe to and select the recurring subscription option. Follow the guided purchase process in the Sentinel Hub Dashboard and conclude your purchase. Then cancel your subscription as described here.

In order for the subscription to be valid for only one month, you must cancel it within 30 days from the day you set up the monthly subscription.