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Goal. The moment someone completes a purchase, send an order confirmation, then follow up a few days later to drive repeat business. Who it’s for. Web2 teams with email (e-commerce, SaaS upgrades, marketplaces). The Web3 parallel, a purchase that happens on-chain, is On-chain purchase follow-up. Outcome to move. Repeat purchase rate and revenue per customer.

Prerequisites

Build it

1

Send the purchase event from your backend

When your checkout succeeds, send a purchase_completed event. Put the order facts in payload (they stay with the event) and buyer traits in attributes (they attach to the contact).
The idempotencyKey (here order:A-1024) stops a retried request from sending two confirmations for one order. Build it from something stable like the order id. See Idempotency.
2

Confirm the order

Build an automation that triggers on purchase_completed and sends a confirmation email, personalized with the order_id and total_usd from the event.trigger (purchase_completed) → send email (Order confirmed)
3

Follow up to drive the next purchase

Extend the flow with a wait and a nudge:→ wait 5 days → send email (You might also like…)Branch on total_usd to treat big-ticket buyers differently from small ones.
4

Activate and publish.

As with any automation, both are required.

Test

Send the event with your own email and a test order_id, then confirm the confirmation email arrives and reads correctly. Re-send the same idempotencyKey to prove a duplicate doesn’t double-send.

Measure

  • Confirmation deliverability (it should be near 100%; a confirmation that bounces is a support ticket).
  • Repeat purchase rate among people who entered the follow-up.
  • Revenue attributed to the follow-up email via the campaign report.

Variations

  • Refunds and cancellations. Send purchase_refunded and branch to a different message.
  • Post-purchase onboarding. For software, chain the confirmation into a short “get the most from it” series.
  • Web3 parallel. For an on-chain purchase, see On-chain purchase follow-up.