NEW YORK (AP) — Amazon has been quietly raising the amount some customers must spend on its site to get free shipping.To qualify for no-cost deliveries, some Amazon customers who don’t have Prime memberships now need to spend $35, up from $25 previously.Amazon spokesperson Kristina Pressentin confirmed the company is testing the new qualification, which was first reported by the blog eCommerce Bytes. The change doesn’t impact Prime members who pay $14.99 per month, or $139 a year, for free shipping and other perks.“We continually evaluate our offerings and make adjustments based on those assessments,” Pressentin said.For now, the new…