I am having "we couldn't process your payment" as i tried to pay for subscription, why?

Hi there! It is a great joy to receive your first post in the Community. I'll share details about your billing concerns in QuickBooks Online.

You may be encountering an 81624 error, which indicates a failure to authorize payment. This is typically caused by the following factors:

• Invalid address.
• Your entered information does not correspond to that of your banking institution.
• The financial institution might prevent Intuit from using your credit card to make a purchase.
• Cache-related issue.

Please verify that everything is accurate so we can fix this. To confirm some information, you might need to contact your credit card provider. Let's also perform a few browser troubleshooting steps to fix the cache problem. Start by opening an incognito window and logging into your account. Here are some quick-access keys:

• Safari: Command + Shift + N
• Mozilla Firefox: CTRL + Shift + P
• Google Chrome: CTRL + Shift + N

If it works, return to your default browser and clear the cache. By doing this, you can get rid of any old information that has accumulated on your browser and is causing strange system behavior. 

I advise getting in touch with our Customer Service Support if the problem continues. They have the tools to monitor your account, determine what's happening, and carry out further information.

I've also included the following article for reference in managing your credentials in QuickBooks Online: Change your email, user ID, or password for QuickBooks Online.

If you have further questions, the Community is always here to help you. Don't hesitate to get back yo us. Take care!