package notification.services.guardian
import models.{PlatformCount, Topic}
import play.api.libs.ws.WSClient
import utils.LruCache

import scala.concurrent.{ExecutionContext, Future}
import scala.concurrent.duration.DurationLong

class ReportTopicRegistrationCounter(
  ws: WSClient,
  registrationCounterUrl: String
)(implicit ec: ExecutionContext) extends TopicRegistrationCounter {

  val lruCache: LruCache[PlatformCount] = new LruCache[PlatformCount](200, 1000, 3.days)

  override def count(topics: List[Topic]): Future[PlatformCount] = {
    lruCache(topics.toSet) {
      val topicParameters = topics.map(topic => "topics" -> topic.toString)
      ws.url(registrationCounterUrl)
        .withQueryStringParameters(topicParameters: _*)
        .get
        .map(response => response.json.as[PlatformCount])
    }
  }
}

package notification.services.guardian
import models.{PlatformCount, Topic}
import play.api.libs.ws.WSClient
import utils.LruCache

import scala.concurrent.{ExecutionContext, Future}
import scala.concurrent.duration.DurationLong

class ReportTopicRegistrationCounter(
  ws: WSClient,
  registrationCounterUrl: String
)(implicit ec: ExecutionContext) extends TopicRegistrationCounter {

  val lruCache: LruCache[PlatformCount] = new LruCache[PlatformCount](200, 1000, 3.days)

  override def count(topics: List[Topic]): Future[PlatformCount] = {
    lruCache(topics.toSet) {
      val topicParameters = topics.map(t => "t" -> t.toString)
      ws.url(registrationCounterUrl)
        .withQueryStringParameters(topicParameters: _*)
        .get
        .map(response => response.json.as[PlatformCount])
    }
  }
}

--- 
+++ 
@@ -15,7 +15,7 @@
 
   override def count(topics: List[Topic]): Future[PlatformCount] = {
     lruCache(topics.toSet) {
-      val topicParameters = topics.map(t => "t" -> t.toString)
+      val topicParameters = topics.map(topic => "topics" -> topic.toString)
       ws.url(registrationCounterUrl)
         .withQueryStringParameters(topicParameters: _*)
         .get
Use the actual parameter name
