Hi Kevin,
One of my clients uses SecureTrading and are looking to migrate to HikaShop (while they also upgrade to Joomla 2.5)
I'm looking at putting together a payment plugin for Secure Trading and am in the early stages of development
I've managed to create the payment links and create the link through to Secure Trading (STPP), and am now working on the notifications.
Let me know if you're still looking at Secure Trading as I'm a partner with them, and can possibly obtain preferential rates if you wanted to go with them.
Regards
Phil
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Guernsey Hosting
www.guernseyhosting.co.uk