https://www.notion.com/help/upgrade-or-downgrade-your-plan?slug=upgrade-or-downgrade-your-plan#faq
“How do refunds work?
Our refund policy is simple. If you believe you've made a mistake signing up for a paid Notion subscription online or in-app, please contact us inside the app or email team@makenotion.com. We'll be happy to refund you the full amount (not pro-rated) if you downgrade your subscription within three days of signing up for monthly billing, or within 30 days of signing up for annual billing.
If you have accidentally added members to your workspace, you can remove those members at any time. If you’ve been charged for members who were accidentally added, we're happy to provide a refund of the prorated charges if you reach out within three days of the invoice date (please make sure the additional members have been removed from your workspace when writing in).
And if for any reason you're unhappy with Notion, please let us know at team@makenotion.com — we'd love to hear your feedback, and will be happy to work with you to create the best experience possible.”
按照这个引导，找个理由发邮件过去申请退款就行了，你这种当天付款当天退款的应该很好退。
