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You can check your QuickBooks Payments account setup to verify if it's causing the issue. Here's how:
Moreover, there is a limitation on how much your client could pay you in a day or a month. This might be the reason why they're unable to pay you via online payment. To check your daily limits, reach out to our customer support.
For more troubleshooting steps, check out this article: What to do if customers can't pay their invoices online.
You can also share with us the exact error message your customers are getting when paying online. In the meantime, follow the suggested steps I shared above to fix the issue.
Let me know if you have any other QuickBooks-related concerns. I'll be here to assist you further. Have a good one.