A short explanation may be appropriate.
Our site is WordPress based with third party plug-ins to cater for what WordPress does not provide. One of these plug-ins handles the interface between PayPal and our data base.
PayPal changed their system in early June in a manner which dislocated this interface, and the plug-in provider was unwilling to change theirs after much discussion.
My technical help has had to find a work-around which is now in place.