We're looking into setting up an additional Gateway for clients to pay via Debit/Credit Cards, we currently accept PayPal but some people prefer not to use it, having the additional gateway is always handy.
I'm just interested to see what some of the most popular gateways are for those of you processing Credit/Debit Card Payments, that have active modules for WHMCS. I've taken a look at Stripe, but your feedback on other alternatives is highly appreciated.
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Another thumbs up for Stripe! Their API is extremely easy to implement and use. Sorry, I have no experience with WHMCS. PayPal is starting to step up to the plate and a lot of our clients still prefer it, but we have clients being processed via Stripe as well without any problems.