How Fashion’s Relationship With Buy Now, Pay Later Is Changing

When fashion tastemakers file into the Revolve Gallery during New York Fashion Week, the online retailer expects that splashy displays by labels like Aya Muse, Kim Shui and Michael Costello will inspire them to snap up hundreds of thousands of dollars in merchandise.

For Revolve, what they don’t see is equally important.

The installation is doubling as the debut of a new checkout process, a product created by technology service provider Bolt,…