Stripe + Postmark integration

Plandalf has no Postmark steps and does not sync Stripe customers into Postmark. What does work is Send Webhook calling Postmark's Email API with your server token, so a paid Stripe checkout sends a template from your own Postmark server. Plandalf's built-in Send Email is the simpler route if you do not need Postmark.

1. Prepare Postmark

   Create the template in your Postmark server, give it an alias and copy the server token from the API Tokens tab. Postmark requires a confirmed sender signature for the From address.

2. Create the sequence

   In Plandalf open Automation, then My Sequences, and choose Plandalf with Checkout Completed as the trigger. Pick your offer and a recent checkout as the sample on the Test tab.

3. Add Send Webhook

   Set POST and the URL https://api.postmarkapp.com/email/withTemplate. Add headers X-Postmark-Server-Token with your token, plus Accept and Content-Type set to application/json.

4. Write the JSON body

   Set From to your signature address, To to {{trigger.customer_email}}, TemplateAlias to your alias and a TemplateModel object with name as {{trigger.customer_first_name}}, total as {{trigger.total_amount}} and invoice as {{trigger.invoice_number}}.

5. Test, then rehearse

   A step test sends a real email, so use your own address. Then switch on Run on test purchases, buy with a Stripe test card, check the run in the Events view and switch the setting off.

6. Decide who sends the receipt

   If Postmark sends the confirmation, leave Send Order Receipt out of the sequence so the buyer does not get two.

• Postmark's send endpoint needs a confirmed sender signature for the From address and a server token in the X-Postmark-Server-Token header. Keep the token in the step headers, never in page code.
• Messages go to the outbound transactional stream unless you set MessageStream. Check Postmark's guidance before using a stream for anything promotional.
• A To field holds at most 50 addresses in Postmark. Plandalf sends one buyer per run, so this only matters if you add recipients.
• Send Webhook waits 30 seconds for the answer and Plandalf's docs promise no retries. If Postmark returns an error, read the step output in the Events view.
• Plandalf has no Postmark trigger. Anything that should flow back in has to come from your own code or Zapier calling a Plandalf catch URL.

Does Stripe integrate with Postmark?

Not directly through Plandalf. Plandalf has no Postmark app, so a paid Stripe checkout reaches Postmark by a Send Webhook step that calls Postmark's API. Check Postmark's own integrations list for other routes.

How do I send Stripe purchase emails through Postmark?

Create a Postmark template, then add a Send Webhook step to a Plandalf sequence on Checkout Completed that posts to Postmark's send-with-template endpoint with your server token.

Do I need Postmark if Plandalf can send email?

No. Plandalf's Send Email and Send Order Receipt steps work from a verified sending domain. Postmark is for sellers who want their own templates and message streams.

Can a Plandalf countdown go in a Postmark template?

Yes. Paste the promo's image tag into the template and make sure the template model includes the email field you use as the ref.

Checked October 26, 2026 against Plandalf's own setup guides and the vendor documentation: Postmark developer docs: templates API, send email with template, Postmark developer docs: email API.