We couldn't process your payment. Make sure your billing info is up to date. If the issue persists, please contact support and reference this message. (Error code:-81624

Thanks for posting here in the community for QuickBooks, @clemens-wolf-mmc.

I want to make sure you're able to get your account up and running. I want to personally check on this for you, but account related concerns are mainly handled by our live support.

For security purposes, we do not handle account management questions to protect your data in this public page. We have dedicated customer service agents who can review your company ID and update your account details. Follow these steps to get a live support to help you update your payment details:

1. Go to the Help menu in QuickBooks, then choose the Search tab.
2. At the bottom click on Contact us.
   
3. Enter the keyword Account Management and Billing in the What can we help you with? box.
   
4. On the next screen, scroll down to How would you like to connect with us section.
5. Choose Chat with us to initiate a discussion with a live agent.
6. Enter you account contact information then press Get a chat.
7. When using this option, make sure to enable pop-up windows. The chat box will appear at the bottom right section of your monitor, and an agent will be with you shortly after. See this:

When you're connected, provide all the information about your concern with our representative.

If you have other QuickBooks concerns besides this billing topic, post here again. I want to make sure you get the answers you need and I'll be right here to lend a hand. Have a nice day!