Welcome and thanks for reaching out to the Community, @homiyar.

May I know what specific problems or issues you're having with your subscription billing? Are you getting any error messages? Any additional information will help me provide the best resolution.

In the meantime, to check if this is a browser-related (cache and cookies) issue, try signing into your QuickBooks Online (QBO) using a private browser (incognito).

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

If everything looks good, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

For more information about changing your billing info, payment method, upgrading and downgrading your subscription, consider checking out this article: Update billing, payment, and subscription info in QuickBooks Online.

Reach out to me in the comment section below if you have any additional questions. I'll be here to help. Have a good one!