> Open a Plandalf offer from a Shopify page and send the buyer's receipt or follow-up through your own Postmark server, using Send Webhook to Postmark's Email API. Source: https://plandalf.com/apps/shopify/integrations/postmark Last modified: 2026-10-26 Checkout embed # Shopify + Postmark integration Postmark is where transactional email is sent, not a list. Plandalf can call its Email API after a purchase made from a Shopify page. [Start your 14-day free trial](https://admin.plandalf.dev/signup)[Jump to the setup](#setup) No credit card required. No coding required. **Shopify** **Postmark** ## Does Shopify integrate with Postmark? Plandalf does not read your Shopify orders and has no native Postmark step. Plandalf sends receipts and emails itself, and it can also call Postmark's Email API with Send Webhook or Zapier. A Plandalf offer opened from a Shopify page can then email the buyer from your own Postmark server. ## What moves between Shopify and Postmark Event From and to Through What happens Offer opened from a Shopify page ShopifyPlandalf Checkout embed The SDK loads from the theme and a button opens the offer. The Shopify cart and its order emails stay as they are. Checkout completed Plandalf (paid via Stripe)Postmark Webhook Send Webhook POSTs to Postmark's send endpoint at `api.postmarkapp.com/email`. Postmark's reference requires a server token header, a confirmed From address, a To address and an HTML or text body. Cart recovery PlandalfPostmark Webhook A failed payment includes a `retry_url`. A Send Webhook step can put that link in a Postmark email so the buyer can finish the payment. Cart abandoned PlandalfPostmark Webhook A visitor who typed an email but did not pay can be sent a reminder from Postmark after a wait of 5 minutes to 7 days. Invoice refunded StripePostmark Webhook A refund that succeeds in Stripe can start a sequence that emails a refund notice through Postmark, using the refund amount variables from the trigger. ## Email a Plandalf buyer through Postmark after a Shopify page sale You need a Shopify theme you can edit, a published Plandalf offer and a Postmark server with a confirmed sender signature. 1. ### Put the offer on the Shopify page Add the Plandalf SDK script before the closing `body` tag of `theme.liquid` and a button with `data-plandalf-present` on the right template. Leave the native add-to-cart button doing its own job. 2. ### Get a Postmark server token Postmark's Email API reference says requests carry an `X-Postmark-Server-Token` header, a server-level token from the API Tokens tab of the server. Postmark also says the From address must be a registered, confirmed sender signature. 3. ### Start a sequence on Checkout Completed In Plandalf open Automation, then My Sequences, choose Plandalf and Checkout Completed, and pick the offer. Use the Test tab to select a recent checkout so the variable menu fills. 4. ### Add Send Webhook for Postmark Add Plandalf, Send Webhook, POST, to `https://api.postmarkapp.com/email`. In Headers add the server token header and an Accept of application/json. Plandalf sends application/json as the Content-Type when you leave it blank. 5. ### Write the message Build a payload with `From` as your signature address, `To` as `{{trigger.customer_email}}`, and an HTML or text body that mentions `{{trigger.line_items_summary}}`. For stored templates, read Postmark's Templates section for the template send call and its fields. 6. ### Test and check the result Switch on Run on test purchases, buy through the test link with your own email, and open the run in the Events view. Postmark's batch endpoint returns 200 even when single messages fail, so if you ever use it, read each message's result. ## What sellers do with Shopify and Postmark ### Branded receipts from your own domain A shop that sells a service package as a Plandalf offer wants the receipt to come from its Postmark server, using its own template. The sequence posts the order details to Postmark, so the message matches the store's other transactional email. ### Payment failure notices for a subscription offer A store sells a monthly box as a Plandalf subscription. When a renewal payment fails, Cart Recovery starts a Postmark email carrying the `retry_url`, so the notice looks like the rest of the store's mail. ## Limits and gotchas - Plandalf has its own Send Email and Send Order Receipt steps. Use Postmark only when the message must leave from your Postmark server or use a template stored there. - Postmark is a sending service, not an audience. Nothing here adds the buyer to a list or tags them, so pair it with an email platform if you need that. - The Postmark server token sits in the step's headers. Plandalf does not sign Send Webhook requests, so limit the token to the one server you send from. - Postmark's reference describes an optional MessageStream field, with the default outbound stream used when it is omitted. Choose the stream that matches the kind of message you send. - Plandalf waits up to 30 seconds for a reply and its docs say not to assume automatic retries, so read the step result before relying on a Postmark email for something like a download link. ## Shopify and Postmark: common questions Does Shopify integrate with Postmark? Plandalf cannot tell you what Shopify and Postmark do with each other, so check Postmark's own integrations list for that. Between Plandalf and Postmark there is no native step, and the connection is a Send Webhook call to Postmark's Email API. How do I send Plandalf emails through Postmark? Build a sequence on Checkout Completed with a Send Webhook step that posts to Postmark's send endpoint with your server token in the headers. The recipe above lists the fields. Shopify Postmark integration: can Plandalf send my Shopify order emails? No. Plandalf does not read Shopify orders. It emails only the buyers of offers that were paid through Plandalf. Do I need Postmark if Plandalf already sends receipts? No. Send Order Receipt and Send Email work without Postmark. Postmark is useful when you want mail sent from your own Postmark server or built from its templates. ## Guides for this pair - [Plandalf with Shopify](https://plandalf.com/platforms/shopify) - [Plandalf with Postmark](https://plandalf.com/platforms/postmark) - [Shopify setup guide](https://plandalf.com/docs/platforms/shopify) - [Webhooks, inbound and outbound](https://plandalf.com/docs/api/webhooks) - [Automations overview](https://plandalf.com/docs/integrations/plandalf) [Start your 14-day free trial](https://admin.plandalf.dev/signup) ## More from Shopify and Postmark - [**Shopify + Kit (ConvertKit)**Kit's Shopify app syncs the store's customers. A Plandalf offer opened from a Shopify page tags its own buyers in Kit and starts their emails.](https://plandalf.com/apps/shopify/integrations/convertkit) - [**Shopify + Drip**A Plandalf offer opened from a Shopify page can tag the buyer in Drip and record a purchase event that starts a Drip workflow.](https://plandalf.com/apps/shopify/integrations/drip) - [**Shopify + Flodesk**A Plandalf offer opened from a Shopify page can end with the buyer in a Flodesk segment, through a Send Webhook step that calls Flodesk's API.](https://plandalf.com/apps/shopify/integrations/flodesk) - [**Stripe + Postmark**A Stripe-paid Plandalf checkout can trigger your own Postmark template through a Send Webhook step that calls Postmark's email API.](https://plandalf.com/apps/stripe/integrations/postmark) Checked October 26, 2026 against Plandalf's own setup guides and the vendor documentation: [Postmark developer docs: Email API](https://postmarkapp.com/developer/api/email-api).