NEW YORK--(BUSINESS WIRE)--Shopify Inc., a leading cloud-based, multichannel commerce platform, today announced its sixth Build a Business Competition, the world’s largest entrepreneurial contest that challenges anyone with a great business idea to start a business and start selling. This year, Shopify is partnering with the New York Stock Exchange to give five entrepreneurs the experience of a lifetime by ringing The Opening Bell® at the New York Stock Exchange and then spending five days at O