now.json

{
  "version": 2,
  "builds": [
    { "src": "index.html", "use": "@now/static" },
    { "src": "src/index.js", "use": "@now/node" }
  ],
  "routes": [
    {
      "headers": {
          "Access-Control-Allow-Origin": "*",
          "Access-Control-Allow-Methods": "GET, POST, PUT, DELETE",
          "Access-Control-Allow-Headers": "X-Requested-With, Content-Type, Accept"
      },
      "src": "/.*",
      "dest": "/src/index.js"
    },
    {
      "src": "/",
      "dest": "/index.html",
      "methods": ["GET"]
    },
    {
      "src": "/cart",
      "dest": "/src/index.js",
      "methods": ["POST"]
    },
    {
      "src": "/cart",
      "dest": "/src/index.js",
      "methods": ["PUT"]
    },
    {
      "src": "/cart/customer",
      "dest": "/src/index.js",
      "methods": ["PUT"]
    },
    {
      "src": "/coupon-code",
      "dest": "/src/index.js",
      "methods": ["POST"]
    },
    {
      "src": "/coupon-code",
      "dest": "/src/index.js",
      "methods": ["DELETE"]
    },
    {
      "src": "/tip-amount",
      "dest": "/src/index.js",
      "methods": ["PUT"]
    },
    {
      "src": "/order",
      "dest": "/src/index.js",
      "methods": ["POST"]
    }
  ]
}