diff --git a/spec/src/modules/tracker.js b/spec/src/modules/tracker.js
index e808b818..fce802ad 100644
--- a/spec/src/modules/tracker.js
+++ b/spec/src/modules/tracker.js
@@ -5352,6 +5352,121 @@ describe(`ConstructorIO - Tracker${bundledDescriptionSuffix}`, () => {
 
       expect(tracker.trackRecommendationClick(requiredParameters)).to.equal(true);
     });
+
+    it('Should respond with a valid response when seedItemIds is provided as an array of strings', (done) => {
+      const { tracker } = new ConstructorIO({
+        apiKey: testApiKey,
+        fetch: fetchSpy,
+        ...requestQueueOptions,
+      });
+      const parametersWithSeedItemIds = {
+        ...requiredParameters,
+        seedItemIds: ['item-123', 'item-456', 'item-789'],
+      };
+      tracker.on('success', (responseParams) => {
+        const requestParams = helpers.extractBodyParamsFromFetch(fetchSpy);
+        // Request
+        expect(fetchSpy).to.have.been.called;
+        expect(requestParams).to.have.property('seed_item_ids').to.deep.equal(['item-123', 'item-456', 'item-789']);
+        // Response
+        expect(responseParams).to.have.property('method').to.equal('POST');
+        expect(responseParams).to.have.property('message');
+        done();
+      });
+      expect(tracker.trackRecommendationClick(parametersWithSeedItemIds)).to.equal(true);
+    });
+
+    it('Should respond with a valid response and convert seedItemIds to array when provided as string', (done) => {
+      const { tracker } = new ConstructorIO({
+        apiKey: testApiKey,
+        fetch: fetchSpy,
+        ...requestQueueOptions,
+      });
+      const parametersWithSeedItemIds = {
+        ...requiredParameters,
+        seedItemIds: 'item-123',
+      };
+      tracker.on('success', (responseParams) => {
+        const requestParams = helpers.extractBodyParamsFromFetch(fetchSpy);
+        // Request
+        expect(fetchSpy).to.have.been.called;
+        expect(requestParams).to.have.property('seed_item_ids').to.deep.equal(['item-123']);
+        // Response
+        expect(responseParams).to.have.property('method').to.equal('POST');
+        expect(responseParams).to.have.property('message');
+        done();
+      });
+      expect(tracker.trackRecommendationClick(parametersWithSeedItemIds)).to.equal(true);
+    });
+
+    it('Should respond with a valid response and convert seedItemIds to array when provided as number', (done) => {
+      const { tracker } = new ConstructorIO({
+        apiKey: testApiKey,
+        fetch: fetchSpy,
+        ...requestQueueOptions,
+      });
+      const parametersWithSeedItemIds = {
+        ...requiredParameters,
+        seedItemIds: 123,
+      };
+      tracker.on('success', (responseParams) => {
+        const requestParams = helpers.extractBodyParamsFromFetch(fetchSpy);
+        // Request
+        expect(fetchSpy).to.have.been.called;
+        expect(requestParams).to.have.property('seed_item_ids').to.deep.equal(['123']);
+        // Response
+        expect(responseParams).to.have.property('method').to.equal('POST');
+        expect(responseParams).to.have.property('message');
+        done();
+      });
+      expect(tracker.trackRecommendationClick(parametersWithSeedItemIds)).to.equal(true);
+    });
+
+    it('Should respond with a valid response and omit seed_item_ids when seedItemIds is empty string', (done) => {
+      const { tracker } = new ConstructorIO({
+        apiKey: testApiKey,
+        fetch: fetchSpy,
+        ...requestQueueOptions,
+      });
+      const parametersWithSeedItemIds = {
+        ...requiredParameters,
+        seedItemIds: '',
+      };
+      tracker.on('success', (responseParams) => {
+        const requestParams = helpers.extractBodyParamsFromFetch(fetchSpy);
+        // Request
+        expect(fetchSpy).to.have.been.called;
+        expect(requestParams).to.not.have.property('seed_item_ids');
+        // Response
+        expect(responseParams).to.have.property('method').to.equal('POST');
+        expect(responseParams).to.have.property('message');
+        done();
+      });
+      expect(tracker.trackRecommendationClick(parametersWithSeedItemIds)).to.equal(true);
+    });
+
+    it('Should respond with a valid response and omit seed_item_ids when seedItemIds is empty array', (done) => {
+      const { tracker } = new ConstructorIO({
+        apiKey: testApiKey,
+        fetch: fetchSpy,
+        ...requestQueueOptions,
+      });
+      const parametersWithSeedItemIds = {
+        ...requiredParameters,
+        seedItemIds: [],
+      };
+      tracker.on('success', (responseParams) => {
+        const requestParams = helpers.extractBodyParamsFromFetch(fetchSpy);
+        // Request
+        expect(fetchSpy).to.have.been.called;
+        expect(requestParams).to.not.have.property('seed_item_ids');
+        // Response
+        expect(responseParams).to.have.property('method').to.equal('POST');
+        expect(responseParams).to.have.property('message');
+        done();
+      });
+      expect(tracker.trackRecommendationClick(parametersWithSeedItemIds)).to.equal(true);
+    });
   });
 
   describe('trackBrowseResultsLoaded', () => {
@@ -8385,7 +8500,7 @@ describe(`ConstructorIO - Tracker${bundledDescriptionSuffix}`, () => {
     it('Should throw an error when providing no messageType parameter', () => {
       const { tracker } = new ConstructorIO({ apiKey: testApiKey });
 
-      expect(tracker.on(null, () => {})).to.be.an('error');
+      expect(tracker.on(null, () => { })).to.be.an('error');
     });
 
     it('Should throw an error when providing an invalid callback parameter', () => {
diff --git a/src/modules/tracker.js b/src/modules/tracker.js
index e6dd639c..702e3a05 100644
--- a/src/modules/tracker.js
+++ b/src/modules/tracker.js
@@ -1357,6 +1357,7 @@ class Tracker {
    * @param {number} [networkParameters.timeout] - Request timeout (in milliseconds)
    * @param {string} [parameters.slCampaignId] - Pass campaign id of sponsored listing
    * @param {string} [parameters.slCampaignOwner] - Pass campaign owner of sponsored listing
+   * @param {string[]|string|number} [parameters.seedItemIds] - Item ID(s) to be used as seed
    * @returns {(true|Error)}
    * @description User clicked an item that appeared within a list of recommended results
    * @example
@@ -1372,6 +1373,7 @@ class Tracker {
    *         strategyId: 'complimentary',
    *         itemId: 'KMH876',
    *         itemName: 'Socks',
+   *         seedItemIds: ['item-123', 'item-456'],
    *     },
    * );
    */
@@ -1405,6 +1407,7 @@ class Tracker {
         analyticsTags,
         slCampaignId,
         slCampaignOwner,
+        seedItemIds,
       } = parameters;
 
       if (variationId) {
@@ -1463,6 +1466,14 @@ class Tracker {
         bodyParams.sl_campaign_owner = slCampaignOwner;
       }
 
+      if (typeof seedItemIds === 'number') {
+        bodyParams.seed_item_ids = [String(seedItemIds)];
+      } else if (seedItemIds?.length && typeof seedItemIds === 'string') {
+        bodyParams.seed_item_ids = [seedItemIds];
+      } else if (seedItemIds?.length && Array.isArray(seedItemIds)) {
+        bodyParams.seed_item_ids = seedItemIds;
+      }
+
       const requestURL = `${requestPath}${applyParamsAsString({}, this.options)}`;
       const requestMethod = 'POST';
       const requestBody = applyParams(bodyParams, { ...this.options, requestMethod });
diff --git a/src/types/tracker.d.ts b/src/types/tracker.d.ts
index ba76b95f..443bcdca 100644
--- a/src/types/tracker.d.ts
+++ b/src/types/tracker.d.ts
@@ -165,6 +165,7 @@ declare class Tracker {
       analyticsTags?: Record<string, string>;
       slCampaignId?: string;
       slCampaignOwner?: string;
+      seedItemIds?: string[] | string | number;
     },
     networkParameters?: NetworkParameters
   ): true | Error;