Have been using a version of this labeled some time ago as official Paypal (not the current version in the add-ons section) on osCommerce 2.3
Suddenly this morning customers clicking to confirm order got a blank page (and a security warning in some browsers - but I think that is a mistake).
It turns out that a call to curl_exec in includes/modules/payment/paypal_hss.php causes the failure. This looks like a standard call to establish iframe credentials and something like it appears in other paypal payment modules.
Does anyone have any ideas as to why this should suddenly be failing after several years of more or less reliable functioning? Or how to debug this?
I'd be amazingly grateful for any suggestions.
Toby