Hi there, Julia! Thanks for getting in touch and welcome to the forums. 🙂
Absolutely. We have a full refund policy for all our products within 30 days of purchase. Please email us at pro [at] tri.be with your receipt and we’ll help you out.
I think WP E-Commerce offers an extension that integrates Authorize.net transactions. Check this out and see if that would work. Looks promising but I honestly have not tried it out myself, so it may not be the right fit.
Otherwise, our WooTickets add-on might be another possibility. It integrates with WooCommerce and WooCommerce definitely has an Authorize.net extension.
I hope this helps! Thanks again for reaching out. 🙂
Cheers!
Geoff