diff --git a/packages/destination-actions/src/destinations/klaviyo/__tests__/__snapshots__/snapshot.test.ts.snap b/packages/destination-actions/src/destinations/klaviyo/__tests__/__snapshots__/snapshot.test.ts.snap
index b3f050ecaa..50c4f1340b 100644
--- a/packages/destination-actions/src/destinations/klaviyo/__tests__/__snapshots__/snapshot.test.ts.snap
+++ b/packages/destination-actions/src/destinations/klaviyo/__tests__/__snapshots__/snapshot.test.ts.snap
@@ -53,7 +53,7 @@ exports[`Testing snapshot for actions-klaviyo destination: subscribeProfile acti
 Object {
   "data": Object {
     "attributes": Object {
-      "custom_source": "Segment Klaviyo (Actions) Destination",
+      "custom_source": "TsKr#",
       "profiles": Object {
         "data": Array [
           Object {
diff --git a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/__tests__/index.test.ts b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/__tests__/index.test.ts
index ff86f1ffd5..0f2fd37cfc 100644
--- a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/__tests__/index.test.ts
@@ -20,107 +20,10 @@ describe('Subscribe Profile', () => {
     ).rejects.toThrowError(PayloadValidationError)
   })
 
-  it('should throw error if both subscribe_email and subscribe_sms are false', async () => {
-    const event = createTestEvent({
-      type: 'track',
-      context: {
-        traits: {
-          email: 'segment@test.com',
-          phone_number: '+17065802344'
-        }
-      }
-    })
-    // subscribe_email: false, subscribe_sms: false,
-    const mapping = {
-      klaviyo_id: '',
-      subscribe_email: false,
-      subscribe_sms: false,
-      list_id: '',
-      consented_at: {
-        '@path': '$.timestamp'
-      },
-      email: {
-        '@path': '$.context.traits.email'
-      },
-      phone_number: {
-        '@path': '$.context.traits.phone_number'
-      }
-    }
-
-    await expect(testDestination.testAction('subscribeProfile', { event, settings, mapping })).rejects.toThrowError(
-      PayloadValidationError
-    )
-  })
-
-  it('should throw error if (email = "", email_subscribed = true; phone = "+17065802344", subscribe_sms = false)', async () => {
-    const event = createTestEvent({
-      type: 'track',
-      context: {
-        traits: {
-          email: '',
-          phone_number: '+17065802344'
-        }
-      }
-    })
-    // subscribe_email: true, subscribe_sms: false,
-    const mapping = {
-      klaviyo_id: '',
-      subscribe_email: true,
-      subscribe_sms: false,
-      list_id: '',
-      consented_at: {
-        '@path': '$.timestamp'
-      },
-      email: {
-        '@path': '$.context.traits.email'
-      },
-      phone_number: {
-        '@path': '$.context.traits.phone_number'
-      }
-    }
-
-    await expect(testDestination.testAction('subscribeProfile', { event, settings, mapping })).rejects.toThrowError(
-      PayloadValidationError
-    )
-  })
-
-  it('should throw error if (email = "valid@email.com", email_subscribed = false; phone = "", subscribe_sms = true)', async () => {
-    const event = createTestEvent({
-      type: 'track',
-      context: {
-        traits: {
-          email: 'valid@email.com',
-          phone_number: ''
-        }
-      }
-    })
-    // subscribe_email: false, subscribe_sms: true,
-    const mapping = {
-      klaviyo_id: '',
-      subscribe_email: false,
-      subscribe_sms: true,
-      list_id: '',
-      consented_at: {
-        '@path': '$.timestamp'
-      },
-      email: {
-        '@path': '$.context.traits.email'
-      },
-      phone_number: {
-        '@path': '$.context.traits.phone_number'
-      }
-    }
-    await expect(testDestination.testAction('subscribeProfile', { event, settings, mapping })).rejects.toThrowError(
-      PayloadValidationError
-    )
-  })
-
   it('formats the correct request body when list id is empty', async () => {
     const payload = {
       email: 'segment@email.com',
       phone_number: '+17067675219',
-      subscribe_email: true,
-      subscribe_sms: true,
       list_id: '',
       klaviyo_id: '6789',
       timestamp: '2024-04-01T18:37:06.558Z'
@@ -176,8 +79,6 @@ describe('Subscribe Profile', () => {
 
     const mapping = {
       klaviyo_id: payload.klaviyo_id,
-      subscribe_email: payload.subscribe_email,
-      subscribe_sms: payload.subscribe_sms,
       list_id: payload.list_id,
       consented_at: {
         '@path': '$.timestamp'
@@ -199,8 +100,6 @@ describe('Subscribe Profile', () => {
     const payload = {
       email: 'segment@email.com',
       phone_number: '+17067675219',
-      subscribe_email: true,
-      subscribe_sms: true,
       list_id: '12345',
       klaviyo_id: '6789',
       timestamp: '2024-04-01T18:37:06.558Z'
@@ -264,8 +163,6 @@ describe('Subscribe Profile', () => {
 
     const mapping = {
       klaviyo_id: payload.klaviyo_id,
-      subscribe_email: payload.subscribe_email,
-      subscribe_sms: payload.subscribe_sms,
       list_id: payload.list_id,
       consented_at: {
         '@path': '$.timestamp'
@@ -283,12 +180,9 @@ describe('Subscribe Profile', () => {
     ).resolves.not.toThrowError()
   })
 
-  it('formats the correct request body when only email channel is subscribed', async () => {
+  it('formats the correct request body when only email is provided', async () => {
     const payload = {
       email: 'segment@email.com',
-      phone_number: '+17067675219',
-      subscribe_email: true,
-      subscribe_sms: false,
       list_id: '12345',
       klaviyo_id: '6789',
       timestamp: '2024-04-01T18:37:06.558Z'
@@ -306,7 +200,6 @@ describe('Subscribe Profile', () => {
                 attributes: {
                   id: payload.klaviyo_id,
                   email: payload.email,
-                  phone_number: payload.phone_number,
                   subscriptions: {
                     email: {
                       marketing: {
@@ -338,16 +231,13 @@ describe('Subscribe Profile', () => {
       timestamp: payload.timestamp,
       context: {
         traits: {
-          email: payload.email,
-          phone_number: payload.phone_number
+          email: payload.email
         }
       }
     })
 
     const mapping = {
       klaviyo_id: payload.klaviyo_id,
-      subscribe_email: payload.subscribe_email,
-      subscribe_sms: payload.subscribe_sms,
       list_id: payload.list_id,
       consented_at: {
         '@path': '$.timestamp'
@@ -365,12 +255,9 @@ describe('Subscribe Profile', () => {
     ).resolves.not.toThrowError()
   })
 
-  it('formats the correct request body when only sms channel is subscribed', async () => {
+  it('formats the correct request body when only phone number is provided', async () => {
     const payload = {
-      email: 'segment@email.com',
       phone_number: '+17067675219',
-      subscribe_email: false,
-      subscribe_sms: true,
       list_id: '12345',
       klaviyo_id: '6789',
       timestamp: '2024-04-01T18:37:06.558Z'
@@ -387,7 +274,6 @@ describe('Subscribe Profile', () => {
                 type: 'profile',
                 attributes: {
                   id: payload.klaviyo_id,
-                  email: payload.email,
                   phone_number: payload.phone_number,
                   subscriptions: {
                     sms: {
@@ -420,7 +306,6 @@ describe('Subscribe Profile', () => {
       timestamp: payload.timestamp,
       context: {
         traits: {
-          email: payload.email,
           phone_number: payload.phone_number
         }
       }
@@ -428,8 +313,6 @@ describe('Subscribe Profile', () => {
 
     const mapping = {
       klaviyo_id: payload.klaviyo_id,
-      subscribe_email: payload.subscribe_email,
-      subscribe_sms: payload.subscribe_sms,
       list_id: payload.list_id,
       consented_at: {
         '@path': '$.timestamp'
diff --git a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/generated-types.ts b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/generated-types.ts
index e50b58b84c..fd22077a34 100644
--- a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/generated-types.ts
+++ b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/generated-types.ts
@@ -6,25 +6,21 @@ export interface Payload {
    */
   klaviyo_id?: string
   /**
-   * The email address to subscribe or to set on the profile if the email channel is omitted.
+   * The email address to subscribe. If provided, the associated profile will be subscribed to Email marketing.
    */
   email?: string
   /**
-   * Controls the subscription status for email marketing. If set to "yes", the profile's consent preferences for email marketing are set to "SUBSCRIBED"; otherwise, the email channel is omitted.
-   */
-  subscribe_email: boolean
-  /**
-   * The phone number to subscribe or to set on the profile if SMS channel is omitted. This must be in E.164 format.
+   * The phone number to subscribe. This must be in E.164 format. If provided, the associated profile will be subscribed to SMS marketing.
    */
   phone_number?: string
-  /**
-   * Controls the subscription status for SMS marketing. If set to "yes", the profile's consent preferences for SMS marketing are set to "SUBSCRIBED"; otherwise, the SMS channel is omitted.
-   */
-  subscribe_sms: boolean
   /**
    * The Klaviyo list to add the newly subscribed profiles to. If no List Id is present, the opt-in process used to subscribe the profile depends on the account's default opt-in settings.
    */
   list_id?: string
+  /**
+   * A custom method or source to detail source of consent preferences (e.g., "Marketing Event").
+   */
+  custom_source?: string
   /**
    * The timestamp of when the profile's consent was gathered.
    */
diff --git a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/index.ts b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/index.ts
index 33eddf9d3e..a04cf4f407 100644
--- a/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/index.ts
+++ b/packages/destination-actions/src/destinations/klaviyo/subscribeProfile/index.ts
@@ -9,8 +9,7 @@ import { SubscribeProfile, SubscribeEventData } from '../types'
 
 const action: ActionDefinition<Settings, Payload> = {
   title: 'Subscribe Profile',
-  description: 'Subscribe profiles to Email marketing, SMS marketing, or both.',
-  defaultSubscription: 'type = "track"',
+  description: 'Subscribe Klaviyo profiles to Email marketing, SMS marketing, or both.',
   fields: {
     klaviyo_id: {
       label: 'Klaviyo Id',
@@ -19,37 +18,29 @@ const action: ActionDefinition<Settings, Payload> = {
     },
     email: {
       label: 'Email',
-      description: `The email address to subscribe or to set on the profile if the email channel is omitted.`,
+      description: `The email address to subscribe. If provided, the associated profile will be subscribed to Email marketing.`,
       type: 'string',
       format: 'email',
       default: { '@path': '$.context.traits.email' }
     },
-    subscribe_email: {
-      label: 'Subscribe Profile to Email Marketing',
-      description: `Controls the subscription status for email marketing. If set to "yes", the profile's consent preferences for email marketing are set to "SUBSCRIBED"; otherwise, the email channel is omitted.`,
-      type: 'boolean',
-      required: true,
-      default: true
-    },
     phone_number: {
       label: 'Phone Number',
-      description: `The phone number to subscribe or to set on the profile if SMS channel is omitted. This must be in E.164 format.`,
+      description: `The phone number to subscribe. This must be in E.164 format. If provided, the associated profile will be subscribed to SMS marketing.`,
       type: 'string',
       default: { '@path': '$.context.traits.phone' }
     },
-    subscribe_sms: {
-      label: 'Subscribe Profile to SMS Marketing',
-      description: `Controls the subscription status for SMS marketing. If set to "yes", the profile's consent preferences for SMS marketing are set to "SUBSCRIBED"; otherwise, the SMS channel is omitted.`,
-      type: 'boolean',
-      required: true,
-      default: true
-    },
     list_id: {
       label: 'List Id',
       description: `The Klaviyo list to add the newly subscribed profiles to. If no List Id is present, the opt-in process used to subscribe the profile depends on the account's default opt-in settings.`,
       type: 'string',
       dynamic: true
     },
+    custom_source: {
+      label: 'Custom Source',
+      description: 'A custom method or source to detail source of consent preferences (e.g., "Marketing Event").',
+      type: 'string',
+      default: 'Segment Klaviyo (Actions) Destination'
+    },
     consented_at: {
       label: 'Consented At',
       description: `The timestamp of when the profile's consent was gathered.`,
@@ -65,30 +56,18 @@ const action: ActionDefinition<Settings, Payload> = {
     }
   },
   perform: async (request, { payload }) => {
-    const { email, klaviyo_id, phone_number, consented_at, list_id, subscribe_email, subscribe_sms } = payload
+    const { email, klaviyo_id, phone_number, consented_at, list_id, custom_source } = payload
     if (!email && !phone_number) {
       throw new PayloadValidationError('Phone Number or Email is required.')
     }
 
-    // Ensure the properties for at least one marketing channel subscription (Email or SMS) are available
-    if ((!email || subscribe_email !== true) && (!phone_number || subscribe_sms !== true)) {
-      throw new PayloadValidationError('At least one marketing channel (Email or SMS) needs to be subscribed to.')
-    }
-
-    const profileToSubscribe = formatSubscribeProfile(
-      email,
-      phone_number,
-      klaviyo_id,
-      consented_at,
-      subscribe_sms,
-      subscribe_email
-    )
+    const profileToSubscribe = formatSubscribeProfile(email, phone_number, klaviyo_id, consented_at)
 
     const eventData: SubscribeEventData = {
       data: {
         type: 'profile-subscription-bulk-create-job',
         attributes: {
-          custom_source: 'Segment Klaviyo (Actions) Destination',
+          custom_source: custom_source || 'Segment Klaviyo (Actions) Destination', // Use custom_source if populated, otherwise fallback to default value
           profiles: {
             data: [profileToSubscribe]
           }
@@ -122,9 +101,7 @@ function formatSubscribeProfile(
   email: string | undefined,
   phone_number: string | undefined,
   klaviyo_id: string | undefined,
-  consented_at: string | number | undefined,
-  subscribe_sms: boolean,
-  subscribe_email: boolean
+  consented_at: string | number | undefined
 ) {
   const profileToSubscribe: SubscribeProfile = {
     type: 'profile',
@@ -136,7 +113,7 @@ function formatSubscribeProfile(
     }
   }
 
-  if (email && subscribe_email) {
+  if (email) {
     profileToSubscribe.attributes.subscriptions.email = {
       marketing: {
         consent: 'SUBSCRIBED',
@@ -145,7 +122,7 @@ function formatSubscribeProfile(
     }
   }
 
-  if (phone_number && subscribe_sms) {
+  if (phone_number) {
     profileToSubscribe.attributes.subscriptions.sms = {
       marketing: {
         consent: 'SUBSCRIBED',