I set up Paypal a few months ago to receive payments! it has been working fine up until this week and now it is not letting clients pay with credit card on invoices!

Hello info-fionamcguir, There is an issue with paypal recently, It works with disconnect and reconnect PayPal for other customers wherein their clients aren't seeing the option to pay now on the invoice, can you please give this a try and hopefully it will resolve it for you too. You will just need to re-send the invoice to your customers once done. Please get back to us if still having any issues.