PayPal Pain again

We use PayPal on the Spherical Editions web site (which sells my music) to take payments for music. It is very convenient for on-line sales, but every so often there is a blip and the accompanying email either goes astray or gets eaten by my anti-virus software. This means that we get an embarrassing email from someone who has bought music but which has failed to arrive. Ah, the joys of technology!