# Postscript + Klaviyo integration > Sync subscriber data, purchase events, and behavioral triggers across your SMS and email channels so both platforms are always working from the same information. **Canonical page:** https://tray.ai/connectors/postscript-klaviyo-integrations/ **Postscript connector:** https://tray.ai/connectors/postscript-integrations/ **Postscript documentation:** https://tray.ai/documentation/connectors/service/postscript **Klaviyo connector:** https://tray.ai/connectors/klaviyo-integrations/ **Klaviyo documentation:** https://tray.ai/documentation/connectors/service/klaviyo ## Overview Postscript and Klaviyo do different jobs well — Postscript for SMS campaigns that actually convert, Klaviyo for personalized email journeys. But when they run independently, brands miss the chance to coordinate messaging, deduplicate audiences, and build unified customer profiles. Connecting them through tray.ai means every opt-in, purchase signal, and subscriber action flows between both platforms in real time. Most ecommerce brands use both SMS and email, but keeping Postscript and Klaviyo in sync usually means someone's manually exporting lists, reconciling subscriber statuses, and aligning segments. It's slow and things fall through the cracks. Connecting the two on tray.ai lets marketing teams automatically sync opt-ins and opt-outs, mirror audience segments, push purchase and behavioral events in both directions, and trigger coordinated cross-channel flows — no custom code required. The result is cleaner data, a more consistent experience for customers, and time back for your team to focus on something other than spreadsheets. ## Use cases ### Sync New SMS Subscribers to Klaviyo Profiles When a customer opts into Postscript SMS, their profile and consent status are automatically created or updated in Klaviyo. Your email platform always reflects the latest subscriber data, so you can enroll new SMS subscribers into welcome email flows without any manual exports. - Eliminate manual CSV imports and exports between platforms - Trigger Klaviyo welcome email flows the moment an SMS opt-in occurs - Keep accurate, unified customer profiles across both platforms ### Mirror Opt-Out and Unsubscribe Events Across Channels When a contact unsubscribes from SMS in Postscript, the integration automatically updates their suppression status in Klaviyo — and vice versa. Both platforms honor customer preferences in real time, so you're never messaging someone who asked to stop hearing from you. - Stay compliant with TCPA and CAN-SPAM regulations automatically - Prevent messaging lapsed subscribers across either channel - Reduce churn from unwanted double-channel contact ### Pass Klaviyo Segment Membership into Postscript for Targeted SMS Campaigns Take your existing Klaviyo audience segments — VIP customers, high-LTV shoppers, cart abandoners — and automatically sync those lists into Postscript for precisely targeted SMS sends. Your SMS campaigns get the full benefit of segmentation logic you've already built in Klaviyo. - Reuse Klaviyo's advanced segmentation for SMS targeting without rebuilding lists - Increase SMS campaign relevance and reduce opt-out rates - Keep Postscript subscriber lists current as Klaviyo segments update dynamically ### Trigger Coordinated Abandoned Cart Flows Across SMS and Email When a cart abandonment event fires in your ecommerce platform, tray.ai fans that trigger out to both Postscript and Klaviyo at once, launching a recovery sequence across SMS and email simultaneously. Timing gaps, message sequencing, and channel priority are all configurable so you're not piling on the same contact. - Recover more revenue by reaching customers on their preferred channel - Control cross-channel message cadence to avoid contact fatigue - Attribute recovered carts accurately across both channels ### Sync Purchase and Order Events to Both Platforms Order placed, fulfilled, and refunded events from your ecommerce store are automatically forwarded to both Postscript and Klaviyo so each platform has the same transactional context. Postscript can fire post-purchase SMS flows while Klaviyo's purchase-based segments and revenue attribution stay equally current. - Power post-purchase SMS sequences in Postscript with real order data - Keep Klaviyo's revenue attribution and LTV calculations accurate - Enable win-back flows in either channel based on days since last purchase ### Propagate Custom Properties and Tags Between Platforms Custom customer attributes captured in one platform — loyalty tier, product preference, survey responses collected via Postscript SMS — are automatically written to the matching contact record in Klaviyo. Klaviyo profiles get richer without anyone manually moving data between tools. - Enrich Klaviyo profiles with SMS-collected zero-party data - Build hyper-personalized email campaigns using attributes gathered via SMS - Maintain a single source of truth for customer attributes across both tools ### Align Campaign Suppression Lists Before Major Sends Before a large promotional campaign in either Postscript or Klaviyo, automatically cross-reference and suppress contacts who recently got a message in the other channel. During peak periods like BFCM, that coordination matters — both for customer experience and sender reputation. - Protect sender reputation during high-volume promotional events like BFCM - Reduce unsubscribe spikes from cross-channel message overload - Automate suppression list preparation that previously required manual coordination ## Templates ### New Postscript SMS Subscriber → Create or Update Klaviyo Profile Automatically creates or updates a Klaviyo contact profile whenever a new subscriber opts into Postscript, syncing consent status, phone number, and any available email address so both platforms stay current from the moment of opt-in. Connectors used: Postscript, Klaviyo ### Klaviyo Segment Sync → Postscript Subscriber List Periodically fetches members of a defined Klaviyo segment and upserts them into a corresponding Postscript subscriber list, so SMS campaigns can use Klaviyo's segmentation logic without manual list management. Connectors used: Klaviyo, Postscript ### Postscript Opt-Out → Suppress Contact in Klaviyo When a customer unsubscribes from SMS in Postscript, tray.ai immediately reflects that preference in Klaviyo by updating their profile's SMS consent field and optionally suppressing the contact from future email sends. Connectors used: Postscript, Klaviyo ### Ecommerce Order Placed → Sync to Postscript and Klaviyo When a new order is placed in your ecommerce platform, this template fans the order event out to both Postscript and Klaviyo simultaneously, giving each platform the purchase context it needs to trigger its respective post-purchase flows. Connectors used: Postscript, Klaviyo ### Klaviyo Unsubscribe → Update Postscript Subscriber Status Mirrors email unsubscribe events from Klaviyo back to Postscript, updating the subscriber's status so contacts who opt out of email are flagged in your SMS platform for review or cross-channel suppression. Connectors used: Klaviyo, Postscript ### Postscript SMS Survey Response → Enrich Klaviyo Profile Captures zero-party data collected through Postscript SMS keyword flows or surveys and writes the responses as custom properties on the matching Klaviyo contact profile, making that data available for personalization in future email campaigns. Connectors used: Postscript, Klaviyo ## Challenges Tray.ai solves ### Handling Mismatched Identifiers Between Platforms Postscript primarily identifies subscribers by phone number while Klaviyo centers profiles around email addresses, which makes reliably matching the same customer across both systems genuinely tricky — especially when only one identifier is available. **How Tray.ai helps:** tray.ai's workflow logic supports multi-field lookup strategies, so you can match contacts first by phone number, then by email, and handle edge cases like missing fields, duplicates, or newly created profiles with configurable branching — no custom code required. ### Managing Real-Time Consent and Compliance Across Two Platforms Opt-in and opt-out events need to propagate instantly between Postscript and Klaviyo to avoid contacting non-consenting subscribers, but webhook reliability, API latency, and retry logic can make real-time compliance sync fragile. **How Tray.ai helps:** tray.ai has built-in webhook listeners with automatic retry logic and error handling, so consent events are processed reliably even during API outages or timeouts. Failed events are logged and queued for reprocessing — no compliance update gets silently dropped. ### Keeping Large Segment Syncs Scalable and Rate-Limit Safe Syncing large Klaviyo segments — potentially tens of thousands of profiles — into Postscript means paginating through API responses and respecting rate limits on both sides. Managing that manually gets complicated fast. **How Tray.ai helps:** tray.ai handles API pagination automatically and includes configurable rate-limit throttling so bulk segment syncs run reliably without hitting API caps on either platform. Workflows can be scheduled during off-peak hours and broken into manageable batches. ### Avoiding Duplicate or Conflicting Records During Bidirectional Sync When data flows in both directions simultaneously — profile updates written by both Postscript and Klaviyo — there's a real risk of creating duplicate records or overwriting newer data with stale values from the other platform. **How Tray.ai helps:** tray.ai supports conditional logic and timestamp-based conflict resolution, so you can define which platform owns specific fields and skip updates when incoming data is older than what already exists in the destination system. ### Coordinating Cross-Channel Message Timing to Prevent Over-Messaging Without visibility into what the other channel has recently sent, it's easy to hit customers with both an SMS from Postscript and an email from Klaviyo within minutes of each other. That kind of pile-on drives opt-outs fast. **How Tray.ai helps:** tray.ai workflows can query both platforms before triggering a send, checking when the contact last heard from either channel and enforcing configurable quiet windows. That logic runs automatically, so customers get messages at the right cadence regardless of which platform initiates. ## Learn more - Intelligent Integration: https://tray.ai/platform/intelligent-ipaas/ - Merlin Agent Builder: https://tray.ai/platform/merlin-agent-builder/ - Agent Gateway for MCP: https://tray.ai/platform/agent-gateway/ - Book a demo: https://tray.ai/contact/