Why can’t my client pay his invoice with credit card?

Hi culliganwater-nb.

Having your customer pay you directly through QuickBooks is a great way to save time and effort. I'd be happy to help you receive your payment from your client.

If the invoice doesn't have the payment option showing I recommend making sure you have payments turned on and resend the invoice to your customer. You can make sure you have payments turned on by making sure the check box under Online payments on the invoice screen is checked. 

If this doesn't work I recommend reaching out to our support team to get further assistance. You can reach them using one of the following methods:

Schedule a Callback or start a Chat: click (?)Help in the upper right in QuickBooks Online > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
Social Media: Facebook, Twitter, and Instagram.
Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

Have a great day!