We offer free trials on Document 365 subscription based on the subscription period you choose. If you don’t want the subscription, you should cancel it before the current/trial period ends, to make sure no extra periods will be added to it.
If you subscribe from within the app:
You have to contact Apple Customer Support directly at https://getsupport.apple.com/. When getting to this page, click "Billing & Subscriptions" followed by "Subscriptions & Purchases." Then follow the instructions to request a refund.
You can refer to the following page for the step-by-step tutorials: https://support.apple.com/en-us/HT204084
If you subscribe from Kdan Creative Store:
Please contact us at firstname.lastname@example.org. We’ll review your case and see if it meets our refund policy.
We also recommend that you cancel your subscription to prevent being charged again next cycle.