Postscript + Klaviyo
Connect Postscript and Klaviyo to Keep Your SMS and Email Data in Sync
Sync subscriber data, purchase events, and behavioral triggers across your SMS and email channels so both platforms are always working from the same information.
Why integrate Postscript and Klaviyo?
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.
Automate & integrate Postscript & Klaviyo
Use case
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.
Use case
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.
Use case
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.
Use case
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.
Use case
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.
Use case
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.
Use case
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.
Get started with Postscript & Klaviyo integration today
Postscript & Klaviyo Challenges
What challenges are there when working with Postscript & Klaviyo and how will using Tray.ai help?
Challenge
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 Can Help:
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.
Challenge
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 Can Help:
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.
Challenge
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 Can Help:
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.
Challenge
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 Can Help:
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.
Challenge
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 Can Help:
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.
Start using our pre-built Postscript & Klaviyo templates today
Start from scratch or use one of our pre-built Postscript & Klaviyo templates to quickly solve your most common use cases.
Postscript & Klaviyo Templates
Find pre-built Postscript & Klaviyo solutions for common use cases
Template
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.
Steps:
- Postscript webhook fires when a new SMS subscriber opts in
- tray.ai looks up the contact in Klaviyo by email or phone number
- If the profile exists, update it with SMS consent and Postscript subscriber ID; if not, create a new Klaviyo profile
Connectors Used: Postscript, Klaviyo
Template
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.
Steps:
- Scheduled tray.ai workflow fetches all profiles from a specified Klaviyo segment via API
- Each profile is matched to a Postscript subscriber by phone number or email
- Matched subscribers are added to or removed from the target Postscript list based on current segment membership
Connectors Used: Klaviyo, Postscript
Template
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.
Steps:
- Postscript triggers a webhook on SMS opt-out event
- tray.ai identifies the corresponding Klaviyo profile by phone or email
- Klaviyo profile is updated to reflect unsubscribed SMS status and optionally added to a suppression list
Connectors Used: Postscript, Klaviyo
Template
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.
Steps:
- Order event webhook received from ecommerce platform (e.g., Shopify)
- tray.ai transforms order payload into the required format for each platform
- Order event is posted to Postscript and Klaviyo in parallel, triggering their respective post-purchase automations
Connectors Used: Postscript, Klaviyo
Template
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.
Steps:
- Klaviyo webhook fires when a contact unsubscribes from email
- tray.ai queries Postscript for a matching subscriber by email or phone
- Postscript subscriber record is updated with a custom tag or status reflecting the Klaviyo opt-out
Connectors Used: Klaviyo, Postscript
Template
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.
Steps:
- Postscript keyword response or conversational SMS reply is captured via webhook
- tray.ai parses the response and maps it to defined Klaviyo custom property fields
- Klaviyo contact profile is updated with the new attribute, making it available for segmentation and personalization
Connectors Used: Postscript, Klaviyo