diff --git a/global.d.ts b/global.d.ts
index e0a154c3112..b46bc541805 100644
--- a/global.d.ts
+++ b/global.d.ts
@@ -11,6 +11,12 @@ interface ImpactQueueFunction {
   a?: unknown[][]
 }
 
+interface RewardfulGlobal {
+  referral?: string
+  affiliate?: { id?: string; token?: string; name?: string }
+  campaign?: { id?: string; name?: string }
+}
+
 type GtagGetFieldName = 'client_id' | 'session_id' | 'session_number'
 
 interface GtagGetFieldValueMap {
@@ -63,6 +69,7 @@ interface Window {
   gtag?: GtagFunction
   ire_o?: string
   ire?: ImpactQueueFunction
+  Rewardful?: RewardfulGlobal
 }
 
 interface Navigator {
diff --git a/src/platform/telemetry/types.ts b/src/platform/telemetry/types.ts
index e606379eb5f..71d47c3607b 100644
--- a/src/platform/telemetry/types.ts
+++ b/src/platform/telemetry/types.ts
@@ -325,6 +325,7 @@ export interface CheckoutAttributionMetadata {
   ga_session_id?: string
   ga_session_number?: string
   im_ref?: string
+  rewardful_referral?: string
   utm_source?: string
   utm_medium?: string
   utm_campaign?: string
diff --git a/src/platform/telemetry/utils/__tests__/checkoutAttribution.test.ts b/src/platform/telemetry/utils/__tests__/checkoutAttribution.test.ts
index a17522c0443..79a67928338 100644
--- a/src/platform/telemetry/utils/__tests__/checkoutAttribution.test.ts
+++ b/src/platform/telemetry/utils/__tests__/checkoutAttribution.test.ts
@@ -15,6 +15,7 @@ describe('getCheckoutAttribution', () => {
     }
     window.gtag = undefined
     window.ire = undefined
+    window.Rewardful = undefined
     window.history.pushState({}, '', '/')
   })
 
@@ -228,4 +229,47 @@ describe('getCheckoutAttribution', () => {
 
     expect(attribution.im_ref).toBeUndefined()
   })
+
+  it('captures Rewardful referral from window.Rewardful', async () => {
+    window.Rewardful = {
+      referral: 'rwd-abc-123'
+    }
+
+    const attribution = await getCheckoutAttribution()
+
+    expect(attribution.rewardful_referral).toBe('rwd-abc-123')
+  })
+
+  it('returns undefined Rewardful referral when window.Rewardful is absent', async () => {
+    const attribution = await getCheckoutAttribution()
+
+    expect(attribution.rewardful_referral).toBeUndefined()
+  })
+
+  it('returns undefined Rewardful referral when window.Rewardful.referral is empty', async () => {
+    window.Rewardful = { referral: '' }
+
+    const attribution = await getCheckoutAttribution()
+
+    expect(attribution.rewardful_referral).toBeUndefined()
+  })
+
+  it('captures Rewardful referral alongside Impact attribution', async () => {
+    window.history.pushState(
+      {},
+      '',
+      '/?im_ref=impact-url-id&utm_source=affiliate'
+    )
+    window.Rewardful = {
+      referral: 'rwd-xyz-789'
+    }
+
+    const attribution = await getCheckoutAttribution()
+
+    expect(attribution).toMatchObject({
+      im_ref: 'impact-url-id',
+      utm_source: 'affiliate',
+      rewardful_referral: 'rwd-xyz-789'
+    })
+  })
 })
diff --git a/src/platform/telemetry/utils/checkoutAttribution.ts b/src/platform/telemetry/utils/checkoutAttribution.ts
index c525a35a104..fd9b5640ae1 100644
--- a/src/platform/telemetry/utils/checkoutAttribution.ts
+++ b/src/platform/telemetry/utils/checkoutAttribution.ts
@@ -180,6 +180,11 @@ async function getGeneratedClickId(): Promise<string | undefined> {
   }
 }
 
+function getRewardfulReferral(): string | undefined {
+  if (typeof window === 'undefined') return undefined
+  return asNonEmptyString(window.Rewardful?.referral)
+}
+
 export function captureCheckoutAttributionFromSearch(search: string): void {
   const fromUrl = readAttributionFromUrl(search)
   const storedAttribution = readStoredAttribution()
@@ -213,11 +218,13 @@ export async function getCheckoutAttribution(): Promise<CheckoutAttributionMetad
   }
 
   const gaIdentity = await getGaIdentity()
+  const rewardfulReferral = getRewardfulReferral()
 
   return {
     ...attribution,
     ga_client_id: gaIdentity?.client_id,
     ga_session_id: gaIdentity?.session_id,
-    ga_session_number: gaIdentity?.session_number
+    ga_session_number: gaIdentity?.session_number,
+    rewardful_referral: rewardfulReferral
   }
 }