I'm here to ensure your customer can pay you through their credit card, @tim-goodrich-bzb.
There are times that the browser is full of frequently accessed page resources. It may cause the payment link to work inappropriately on your customer's end. That may be the reason they're getting an error message.
First, I'd suggest following any instructions your customer sees in the error message. If there are no steps, you can let them clear their browser's cache to have a clean slate. It helps them get rid of the error so they can pay you through credit card.
Second, let them right-click the Review and pay button in the invoice email and copy the URL. Then, paste the link into the address bar on the browser that you've cleared the cache. They can pay the amount from there.
However, if the error persists, you can let them use other supported browsers. These are Google Chrome, Mozilla Firefox, Microsoft Edge, and Safari. These will also provide them the best and most secure experience with QuickBooks Payments. Just make sure their versions are up to date.
To learn more about the process above, check out this article: What To Do If Customers Can't Pay Their Invoices Online. Then, let them go to the Customers see an error message section.
Once processed, we put the funds into your bank account, depending on your deposit speed. Just go to the Deposit Speed section from the Payments tab in the settings. For more details, see Step 1 through this article: Deposit Times. This site also contains lead times when processing payments. You can click the Learn more about payment deposit schedules link. Then, locate the section that has QuickBooks Online.
Additionally, can I ask for the specific error message your customer is getting when paying the invoice online? If you share it with me, I would appreciate that. I also want to make sure I've got you covered. You can click the Reply button below to add some information.
I'll be right here to help if you need further assistance. Take care always, @tim-goodrich-bzb.
