Mobile payment processor Square just finished its fourth round of funding, netting a $3.25 billion valuation. As AllThingsD reports, the three-year old company raised more than $200 million for this round of funding, though it achieved a lower valuation than the company had previously sought. Meanwhile, Square's chief operating officer is predicting that Apple's iPad and comparable devices will become the point-of-sale devices of choice for most retailers over the next year and a half, a likelihood that bodes well for the mobile payment company.
