How do you use the verifyPassword parameter when initializing an CredentialsHTTPBasic object?

CredentialsHTTPTest.swift

import Credentials
import CredentialsHTTP
import Kitura
import HeliumLogger

// Initialize HeliumLogger
HeliumLogger.use()

// Create a new router
let router = Router()

let credentials = Credentials()
let users = ["John" : "12345", "Mary" : "qwerasdf"]
let basicCredentials = CredentialsHTTPBasic(verifyPassword: { (userID, password, profile: (UserProfile?) -> Void) in
	if (users[userID] == password)
	{
	}
	else
	{
		// nomatch
	}
}, realm: "CredentialsHTTPTest")

credentials.register(plugin: basicCredentials)

router.all("/profile", middleware: credentials)

router.get("/profile", handler:
	{ request, response, next in

		if let profile = request.userProfile
		{
			let userId = profile.id
			let userName = profile.displayName
			
			response.send("Hello, User!")

		}
		else
		{
			response.send("No User")
		}
		next()
})

router.get("/") {
	request, response, next in
	response.send("Hello, World!")
	next()
}

// Add an HTTP server and connect it to the router
Kitura.addHTTPServer(onPort: 8090, with: router)

// Start the Kitura runloop (this call never returns)
Kitura.run()

Package.swift

import PackageDescription

let package = Package(
    name: "CredentialsHTTPTest",
dependencies: [
        .Package(url: "https://github.com/IBM-Swift/Kitura.git", majorVersion: 1, minor: 2),
        .Package(url: "https://github.com/IBM-Swift/HeliumLogger.git", majorVersion: 1, minor: 1),
        .Package(url: "https://github.com/IBM-Swift/Kitura-CredentialsHTTP.git", majorVersion: 1)
    ]
)