Shap tool. That center shape isn't actually part of the shape, but the rounded corner sharp corner hybrid is created using the shape tool. First create the rounded edge square and then fill in the other corners using the rectangle tool.
There's a tutorial up on Yari's blog that explains how I made this card.
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You'd use the same process, except keep different corners rounded. (I did it the way megan said, and I used guides to make sure the shapes lined up exactly)