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Postscript

Send every Shopify event to Postscript, server-side

Q: How do I check that Shopify events are reaching Postscript?

Open Postscript › Subscribers › the individual subscriber's activity feed.

Q: Can one purchase trigger the same flow twice?

No. One order produces one event, so a single purchase cannot trigger the same flow twice.

Q: Do I need a developer to connect Shopify to Postscript?

No. Shopify connects as an app install with no theme edits, and most brands are live in under 20 minutes. Headless storefronts add the Upstack Pixel script instead of the theme app extension.

Each event is resolved to a person against a 750M+ device graph before it reaches Postscript, so flows trigger on a known profile rather than an anonymous session.

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4.6 out of 5 from 36 reviews on the Shopify App Store

US device IDs in the graph: 750M+
Match rate on events: 90%+
Identity window, per customer: Lifetime
Most brands are live: <20 min

How it flows

How a Shopify event reaches Postscript. Captured on the server, resolved to a person, then sent.

01 Capture

Captured from Shopify

One Upstack app setup that captures Shopify storefront and checkout events with the Upstack Pixel, records every order directly from Shopify, and forwards both to every tool you spend on.

See the Shopify integration

ShopifyWhat it sends

order_idShopify order and checkout token
email / phonecustomer contact from checkout
customer_idShopify customer record, if they have one
line_itemsproducts, variants and quantities
total / subtotal / discountorder economics

02 Understand

Resolved to one person before it leaves

Every Shopify event is matched against a 750M+ device graph, so a phone browse and a desktop checkout resolve to one customer rather than two strangers.

How resolution works

Resolved before it is sent

IdentityMatched against a 750M+ device graph, so a phone browse and a desktop checkout resolve to one customer.
customer_typeNew or returning, resolved before send.
DeduplicationOne order produces one event, so a single purchase cannot trigger the same flow twice.
Bot and fraud filteringAutomated traffic never becomes a profile, so list quality and deliverability are not paying for it.

Messaging mistakes are expensive and public. These controls exist so a flow never fires against a profile that should not have received it.

03 Activate

Delivered to Postscript

Send identity-resolved events to Postscript so SMS flows reach subscribers the pixel missed.

See the Postscript integration

PostscriptWhat it receives

phonesubscriber key
emailprofile matching
order / cart propertiesautomation triggers

The catch

Shopify only knows a customer at checkout.

Everything before that (the browse, the add to cart, the return visit four days later) is anonymous unless something resolves it. That is the gap the flows fall into, not a problem with the flows.

Where to check in PostscriptSending you can audit

Postscript Subscribers the individual subscriber's activity feed

What changes

What changes when Shopify feeds Postscript. Two gains on the Postscript side, two on the Shopify side.

Postscript

Server-side delivery

Events reach Postscript through its server API rather than the browser, so ad blockers and ITP don’t cost you conversions.

Postscript

Identity-resolved events

Events sent to Postscript carry the resolved customer whenever Upstack can identify one, matched against a 750M+ device graph.

Shopify

Orders recorded from Shopify itself

Purchases also reach Upstack directly from Shopify, about 10 minutes after the order, so an order still counts when an ad blocker stopped the pixel or the shopper closed the page.

Shopify

Recognize returning customers

Shopify customer IDs, emails and phones are matched against the graph, so repeat buyers are identified across devices.

Setup

Live in under 20 minutes.

App install, no theme edits and no developer.

Upstack dashboardExample

Shopify Data source Connected

Postscript Destination Healthy

Read the full Postscript setup guide

01

Connect Shopify

In the Upstack dashboard, open System, then Data Sources, and click Connect Shopify. Approve the install in your Shopify Admin: Upstack reads products, orders and customers, and writes only its own pixel.
02

Add the Postscript destination

Under Destinations, add Postscript. Every resolved Shopify event is then forwarded to it.
03

Check delivery to Postscript

Trace any event to the profile it resolved to, and see why.

FAQ

Questions about Shopify and Postscript.

How do I check that Shopify events are reaching Postscript?

Open Postscript › Subscribers › the individual subscriber's activity feed.

Can one purchase trigger the same flow twice?

No. One order produces one event, so a single purchase cannot trigger the same flow twice.

Do I need a developer to connect Shopify to Postscript?

No. Shopify connects as an app install with no theme edits, and most brands are live in under 20 minutes. Headless storefronts add the Upstack Pixel script instead of the theme app extension.