I applied online. The process took 2 weeks. I interviewed at Visa Inc. in Apr 2015
Interview
Applied via their website, was emailed by a recruiter a couple days later for a phone interview, mostly behavioral and asking about my resume. A few days later I heard back from the recruiter and set up a second interview. Second interview was very similar to the first, asking about work I've done and how it's applicable to this position. Few days later I got the offer for the internship.
I applied through other source. I interviewed at Visa Inc. (Madrid)
Interview
This is an automated process, which was a surprise. It was very easy and what they ask you to do is clear and easy to follow. Each email contains instructions. Be camera ready always.