playbindings

trait Validator[W, V] extends AnyRef

Defines a validation of values of type V in the context of another type W, for example if W instance wrap values of type V
Defines a validation of values of type V in the context of another type W, for example if W instance wrap values of type V
So if you have case class UserId(id: Long) you might define an implicit Validator[UserId, Long] that checks that the Long value is non-negative.
W
The context in which the validation takes place
V
The type of the values that will be validated
trait ValidatorLowPriorityImplicits extends AnyRef
trait ValueClassFormats extends ValueClassReads with ValueClassWrites
trait ValueClassPathBindable extends AnyRef
trait ValueClassQueryStringBindable extends AnyRef
trait ValueClassReads extends AnyRef
trait ValueClassUrlBinders extends ValueClassPathBindable with ValueClassQueryStringBindable
trait ValueClassWrites extends AnyRef

object Validator extends ValidatorLowPriorityImplicits

Pull the low-priority instances into the companion object so they'll be available in the implicit scope.
object ValueClassFormats extends ValueClassFormats
object ValueClassUrlBinders extends ValueClassUrlBinders

import ValueClassUrlBinders._ to get both the ValueClassPathBindable and ValueClassQueryStringBindable generators in implicit scope.
import ValueClassUrlBinders._ to get both the ValueClassPathBindable and ValueClassQueryStringBindable generators in implicit scope. In particular, add this to your build.sbt to import them into the routes file:
routesImport += "com.wellfactored.playbinders.ValueClassUrlBinders._"