diff --git a/packages/client/src/builders/recommendation/products/index.ts b/packages/client/src/builders/recommendation/products/index.ts
index a972588..908d435 100644
--- a/packages/client/src/builders/recommendation/products/index.ts
+++ b/packages/client/src/builders/recommendation/products/index.ts
@@ -13,4 +13,5 @@ export * from './purchasedWithMultipleProductsBuilder';
 export * from './purchasedWithProductBuilder';
 export * from './searchTermBasedProductRecommendationBuilder';
 export * from './sortProductsBuilder';
-export * from './similarProductsProductBuilder';
\ No newline at end of file
+export * from './similarProductsProductBuilder';
+export * from './popularityMultiplierBuilder';
\ No newline at end of file
diff --git a/packages/client/src/builders/recommendation/products/popularProductsBuilder.ts b/packages/client/src/builders/recommendation/products/popularProductsBuilder.ts
index 62fd211..316972a 100644
--- a/packages/client/src/builders/recommendation/products/popularProductsBuilder.ts
+++ b/packages/client/src/builders/recommendation/products/popularProductsBuilder.ts
@@ -1,11 +1,13 @@
 import { Settings } from '../../../builders/settings';
 import { PopularProductsRequest } from '../../../models/data-contracts';
+import { PopularityMultiplierBuilder } from './popularityMultiplierBuilder';
 import { ProductSettingsRecommendationBuilder } from './productSettingsRecommendationBuilder';
 import { ProductsRecommendationBuilder } from './productsRecommendationBuilder';
 
 export class PopularProductsBuilder extends ProductSettingsRecommendationBuilder implements ProductsRecommendationBuilder<PopularProductsRequest> {
     private since: number = 0;
     private basedOnSelection: 'MostPurchased' | 'MostViewed' = 'MostPurchased';
+    private popularityMultiplierBuilder: PopularityMultiplierBuilder = new PopularityMultiplierBuilder();
 
     constructor(
         settings: Settings) {
@@ -24,6 +26,12 @@ export class PopularProductsBuilder extends ProductSettingsRecommendationBuilder
         return this;
     }
 
+    public setPopularityMultiplier(popularityMultiplierBuilder: (popularityMultiplierBuilder: PopularityMultiplierBuilder) => void) {
+        popularityMultiplierBuilder(this.popularityMultiplierBuilder);
+
+        return this;
+    }
+
     public build() {
         const request: PopularProductsRequest = {
             $type: 'Relewise.Client.Requests.Recommendations.PopularProductsRequest, Relewise.Client',
@@ -31,6 +39,7 @@ export class PopularProductsBuilder extends ProductSettingsRecommendationBuilder
             settings: this.recommendationSettings,
             basedOn: this.basedOnSelection,
             sinceMinutesAgo: this.since,
+            popularityMultiplier: this.popularityMultiplierBuilder.build(),
         };
 
         return request;
diff --git a/packages/client/src/builders/recommendation/products/popularityMultiplierBuilder.ts b/packages/client/src/builders/recommendation/products/popularityMultiplierBuilder.ts
new file mode 100644
index 0000000..951838d
--- /dev/null
+++ b/packages/client/src/builders/recommendation/products/popularityMultiplierBuilder.ts
@@ -0,0 +1,19 @@
+import { DataKeyPopularityMultiplierSelector, PopularityMultiplierSelector } from '../../../models/data-contracts';
+
+export class PopularityMultiplierBuilder {
+    private popularityMultiplierSelector: PopularityMultiplierSelector | null = null;
+
+    public setDataKeyPopularityMultiplierSelector(selector: { key?: string | null }): this {
+        const dataKeyPopularityMultiplierSelector: DataKeyPopularityMultiplierSelector = {
+            $type: 'Relewise.Client.Requests.PopularityMultiplierSelectors.DataKeyPopularityMultiplierSelector, Relewise.Client',
+            ...selector,
+        }
+
+        this.popularityMultiplierSelector = dataKeyPopularityMultiplierSelector;
+        return this;
+    }
+
+    build(): PopularityMultiplierSelector | null {
+        return this.popularityMultiplierSelector;
+    }
+}
\ No newline at end of file
diff --git a/packages/client/tests/integration-tests/productRecommendations.integration.test.ts b/packages/client/tests/integration-tests/productRecommendations.integration.test.ts
index a58fc3c..75115fe 100644
--- a/packages/client/tests/integration-tests/productRecommendations.integration.test.ts
+++ b/packages/client/tests/integration-tests/productRecommendations.integration.test.ts
@@ -1,4 +1,4 @@
-import { DataValueFactory, ProductRecommendationResponse, ProductsViewedAfterViewingProductBuilder, PurchasedWithProductBuilder, Recommender, UserFactory } from '../../src';
+import { DataValueFactory, PopularProductsBuilder, ProductRecommendationResponse, ProductsViewedAfterViewingProductBuilder, PurchasedWithProductBuilder, Recommender, UserFactory } from '../../src';
 import { test, expect } from '@jest/globals'
 
 const { npm_config_API_KEY: API_KEY, npm_config_DATASET_ID: DATASET_ID, npm_config_SERVER_URL: SERVER_URL } = process.env;
@@ -14,7 +14,7 @@ const settings = {
 
 test('PurchasedWithProduct', async() => {
 
-    const result: ProductRecommendationResponse | undefined = await recommender.recommendPurchasedWithProduct(new PurchasedWithProductBuilder(settings).product({productId: '1'}).build());
+    const result: ProductRecommendationResponse | undefined = await recommender.recommendPurchasedWithProduct(new PurchasedWithProductBuilder(settings).product({ productId: '1' }).build());
 
     expect(result).not.toBe(undefined);
     expect(result!.recommendations?.length).toBeGreaterThan(0);
@@ -22,7 +22,7 @@ test('PurchasedWithProduct', async() => {
 
 test('ProductsViewedAfterViewingProduct', async() => {
 
-    const result: ProductRecommendationResponse | undefined = await recommender.recommendProductsViewedAfterViewingProduct(new ProductsViewedAfterViewingProductBuilder(settings).product({productId: '1'}).build());
+    const result: ProductRecommendationResponse | undefined = await recommender.recommendProductsViewedAfterViewingProduct(new ProductsViewedAfterViewingProductBuilder(settings).product({ productId: '1' }).build());
 
     expect(result).not.toBe(undefined);
     expect(result!.recommendations?.length).toBeGreaterThan(0);
@@ -36,18 +36,29 @@ test('ProductsViewedAfterViewingProduct with all conditions', async() => {
         displayedAtLocation: 'integration test Conditions',
         user: UserFactory.anonymous(),
     })
-        .product({productId: '1'})
+        .product({ productId: '1' })
         .filters(f => f
             .addProductDataFilter('ShortDescription', b => b
                 .addContainsCondition(DataValueFactory.stringCollection(['d']), 'Any')
                 .addContainsCondition(DataValueFactory.booleanCollection([true]), 'Any')
                 .addContainsCondition(DataValueFactory.doubleCollection([1]), 'Any')
-                .addContainsCondition(DataValueFactory.multilingual([{language: 'en-us', value: 'd'}]), 'Any')
-                .addContainsCondition(DataValueFactory.multiCurrency([{currency: 'USD', amount: 1}]), 'Any'),          
+                .addContainsCondition(DataValueFactory.multilingual([{ language: 'en-us', value: 'd' }]), 'Any')
+                .addContainsCondition(DataValueFactory.multiCurrency([{ currency: 'USD', amount: 1 }]), 'Any'),
             ));
 
     const result: ProductRecommendationResponse | undefined = await recommender.recommendProductsViewedAfterViewingProduct(recommendationBuilder.build());
 
     expect(result).not.toBe(undefined);
     expect(result!.recommendations?.length).toEqual(0);
+});
+
+test('ProductsViewedAfterViewingProduct with all conditions', async() => {
+
+    const recommendationBuilder = new PopularProductsBuilder(settings)
+        .setPopularityMultiplier(pm => pm.setDataKeyPopularityMultiplierSelector({ key: 'some-data-key' }));
+
+    const result: ProductRecommendationResponse | undefined = await recommender.recommendPopularProducts(recommendationBuilder.build());
+
+    expect(result).not.toBe(undefined);
+    expect(result!.recommendations?.length).toBeGreaterThan(0);
 });
\ No newline at end of file
diff --git a/packages/client/tests/unit-tests/builders/recommendation/popularProductsBuilder.unit.test.ts b/packages/client/tests/unit-tests/builders/recommendation/popularProductsBuilder.unit.test.ts
new file mode 100644
index 0000000..c568eb1
--- /dev/null
+++ b/packages/client/tests/unit-tests/builders/recommendation/popularProductsBuilder.unit.test.ts
@@ -0,0 +1,23 @@
+import { UserFactory } from '../../../../src/factory';
+import { test, expect } from '@jest/globals'
+import { PopularProductsRequest } from '../../../../src/models/data-contracts';
+import { PopularProductsBuilder } from '../../../../src';
+
+function baseBuilder() {
+    return new PopularProductsBuilder({
+        language: 'da-DK',
+        currency: 'DKK',
+        displayedAtLocation: 'unit test',
+        user: UserFactory.anonymous(),
+    });
+};
+
+test('setPopularityMultiplier', () => {
+    const key: string = 'data-key';
+
+    const subject: PopularProductsRequest = baseBuilder()
+        .setPopularityMultiplier(pm => pm.setDataKeyPopularityMultiplierSelector({ key: key }))
+        .build();
+
+    expect(subject.popularityMultiplier?.key).toBe(key);
+});