Hello there, @Systassoc and @jeffp07.

I regret hearing about your experience, please understand that this is not the level of service we aim for you to encounter, especially after the update. It can be a challenging situation, but please know that I'm here to help and support you every step of the way.

We have received reports from other users who are experiencing the same error regarding HTTP STATUS 500 - Internal Server Error when processing payments in QuickBooks Desktop (QBDT). Our engineering team is currently investigating the issue and working on a resolution.

Therefore, I recommend reaching out to our QuickBooks Support team to subscribe to the notification list for affected users. You will receive an email once there are developments regarding the investigation, including the permanent solution. Here's how:

1. Access your QuickBooks Online (QBO) company, go to Help (?).

2. Choose either of these tabs:

• Assistant tab and type Talk to a human.
• Search tab and click on Contact Us to connect with a support expert.

3. Select the preferred method of contact (phone or chat).

Furthermore, here is an article you can use in case you encounter script errors executing a command that involves our application(s) on your computer attempting to access a web-based (internet) feature: Script error when using payments account applications or websites.

Additionally, you may need to configure your firewall or security software to ensure uninterrupted access when using QuickBooks Payments: Configure firewall or security software when using QuickBooks Payments.

Rest assured that our engineers are actively working to resolve this issue. We greatly appreciate your patience as we address this matter. Should you have any other concerns about error 500 when processing payments in QBDT, leave a comment below and I'll be glad to provide the information you need. Take care and have a good one!