I got the following error from paypal within whmcs while a client was trying to purchase a domain from us.
"Things don't appear to be working at the moment. Please try again later."
What do you advise? Thanks
OK thats sods law.
Just got a reply from PayPal (24 hours later)
It turns out that you need to disable 'Encrypted website payments' in your PayPal account settings under Settings -> My Selling Preferences -> Website preferences
I don't know what happened, when this got turned on but after turning this off everything works again.
I would like to also point out that all of my site and services are encrypted with a valid SSL Certificate (I just double checked everything) and I don't remember turning this on so I'm guessing that its been on since day dot or has been added by PayPal as a security thing that I missed.