I send my client his invoice and didnt let him pay, I try it myself, I send me an invoice and didnt let me either, a pop up comes out with payment declined. What I can do

I appreciate you bringing this to our attention, Yunier. Let me share some troubleshooting steps to ensure you can send invoices efficiently.

When processing payments, declines are often caused by your financial institution. To verify this, I recommend contacting your bank to identify any issues preventing you from paying the invoice.

If you have done that and verified that there's no issue on their end. You can use another payment method to check if you can pay the invoice.

However, if you have already used all of those recommendations and the issue persists, I highly suggest contacting our Payments support team. They have specific tools to pull up your account and further investigate the root cause of the declined payment message. Doing this, they can provide additional steps to help you fix it. 

For additional instructions, feel free to read the details from this link: Fix customer's declined credit card payments.

Also, to know more about QuickBooks Payments, feel free to check out the information from these links:

• QuickBooks Payments Deposits FAQ.
• Find out when QuickBooks Payments deposits your money.

Drop a comment below if you need more assistance with customer invoice payments. The Community team is always around to help.