diff --git a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/index.test.ts.snap b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/index.test.ts.snap
index d1fdc7e404..ca3158c655 100644
--- a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/index.test.ts.snap
+++ b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/index.test.ts.snap
@@ -15,3 +15,35 @@ Headers {
   },
 }
 `;
+
+exports[`Topsort.purchase should be successful with default mappings and products object, including brand as vendorId 1`] = `
+Headers {
+  Symbol(map): Object {
+    "authorization": Array [
+      "Bearer bar",
+    ],
+    "content-type": Array [
+      "application/json",
+    ],
+    "user-agent": Array [
+      "Segment (Actions)",
+    ],
+  },
+}
+`;
+
+exports[`Topsort.purchase should be successful with default mappings and products object, including custom vendorId 1`] = `
+Headers {
+  Symbol(map): Object {
+    "authorization": Array [
+      "Bearer bar",
+    ],
+    "content-type": Array [
+      "application/json",
+    ],
+    "user-agent": Array [
+      "Segment (Actions)",
+    ],
+  },
+}
+`;
diff --git a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/snapshot.test.ts.snap b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/snapshot.test.ts.snap
index 956e66ff39..4b80522d03 100644
--- a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/snapshot.test.ts.snap
+++ b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/__snapshots__/snapshot.test.ts.snap
@@ -10,6 +10,7 @@ Object {
           "productId": "4mevd8V",
           "quantity": -6621698275147776,
           "unitPrice": -66216982751477.76,
+          "vendorId": "4mevd8V",
         },
       ],
       "occurredAt": "2021-02-01T00:00:00.000Z",
diff --git a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/index.test.ts b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/index.test.ts
index 943f518523..629db55a60 100644
--- a/packages/destination-actions/src/destinations/topsort/purchase/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/topsort/purchase/__tests__/index.test.ts
@@ -10,15 +10,13 @@ describe('Topsort.purchase', () => {
     nock(/.*/).persist().post(/.*/).reply(200)
 
     const event = createTestEvent({
-      properties: {
-        products: [
-          {
-            product_id: '123',
-            price: 100,
-            quantity: 1
-          }
-        ]
-      }
+      products: [
+        {
+          product_id: '123',
+          price: 100,
+          quantity: 1
+        }
+      ]
     })
 
     const responses = await testDestination.testAction('purchase', {
@@ -50,6 +48,94 @@ describe('Topsort.purchase', () => {
     })
   })
 
+  it('should be successful with default mappings and products object, including brand as vendorId', async () => {
+    nock(/.*/).persist().post(/.*/).reply(200)
+
+    const event = createTestEvent({
+      products: [
+        {
+          product_id: '123',
+          price: 100,
+          quantity: 1,
+          brand: 'v123'
+        }
+      ]
+    })
+
+    const responses = await testDestination.testAction('purchase', {
+      event,
+      settings: {
+        api_key: 'bar'
+      },
+      useDefaultMappings: true
+    })
+
+    expect(responses.length).toBe(1)
+    expect(responses[0].status).toBe(200)
+    expect(responses[0].options.headers).toMatchSnapshot()
+    expect(responses[0].options.json).toMatchObject({
+      purchases: expect.arrayContaining([
+        expect.objectContaining({
+          id: expect.any(String),
+          occurredAt: expect.any(String),
+          opaqueUserId: expect.any(String),
+          items: [
+            {
+              productId: '123',
+              unitPrice: 100,
+              quantity: 1,
+              vendorId: 'v123'
+            }
+          ]
+        })
+      ])
+    })
+  })
+
+  it('should be successful with default mappings and products object, including custom vendorId', async () => {
+    nock(/.*/).persist().post(/.*/).reply(200)
+
+    const event = createTestEvent({
+      products: [
+        {
+          product_id: '123',
+          price: 100,
+          quantity: 1,
+          vendorId: 'v123'
+        }
+      ]
+    })
+
+    const responses = await testDestination.testAction('purchase', {
+      event,
+      settings: {
+        api_key: 'bar'
+      },
+      useDefaultMappings: true
+    })
+
+    expect(responses.length).toBe(1)
+    expect(responses[0].status).toBe(200)
+    expect(responses[0].options.headers).toMatchSnapshot()
+    expect(responses[0].options.json).toMatchObject({
+      purchases: expect.arrayContaining([
+        expect.objectContaining({
+          id: expect.any(String),
+          occurredAt: expect.any(String),
+          opaqueUserId: expect.any(String),
+          items: [
+            {
+              productId: '123',
+              unitPrice: 100,
+              quantity: 1,
+              vendorId: 'v123'
+            }
+          ]
+        })
+      ])
+    })
+  })
+
   it('should fail because it misses a required field (products)', async () => {
     nock(/.*/).persist().post(/.*/).reply(200)
 
diff --git a/packages/destination-actions/src/destinations/topsort/purchase/generated-types.ts b/packages/destination-actions/src/destinations/topsort/purchase/generated-types.ts
index 58fd24788e..935d338437 100644
--- a/packages/destination-actions/src/destinations/topsort/purchase/generated-types.ts
+++ b/packages/destination-actions/src/destinations/topsort/purchase/generated-types.ts
@@ -29,5 +29,9 @@ export interface Payload {
      * Count of products purchased.
      */
     quantity?: number
+    /**
+     * The vendor ID of the product being purchased.
+     */
+    vendorId?: string
   }[]
 }
diff --git a/packages/destination-actions/src/destinations/topsort/purchase/index.ts b/packages/destination-actions/src/destinations/topsort/purchase/index.ts
index 602ee28508..1f3c9696e7 100644
--- a/packages/destination-actions/src/destinations/topsort/purchase/index.ts
+++ b/packages/destination-actions/src/destinations/topsort/purchase/index.ts
@@ -61,15 +61,28 @@ const action: ActionDefinition<Settings, Payload> = {
           description: 'Count of products purchased.',
           type: 'integer',
           required: false
+        },
+        vendorId: {
+          label: 'Vendor ID',
+          description: 'The vendor ID of the product being purchased.',
+          type: 'string',
+          required: false
         }
       },
       default: {
         '@arrayPath': [
-          '$.properties.products',
+          '$.products',
           {
             productId: { '@path': '$.product_id' },
             unitPrice: { '@path': '$.price' },
-            quantity: { '@path': '$.quantity' }
+            quantity: { '@path': '$.quantity' },
+            vendorId: {
+              '@if': {
+                exists: { '@path': '$.vendorId' },
+                then: { '@path': '$.vendorId' },
+                else: { '@path': '$.brand' }
+              }
+            }
           }
         ]
       }