Integration pair

Substack + Flodesk

Use Substack and Flodesk together with Plandalf as the layer that ties checkout, payments, invoices, integrations, and lifecycle automation together.

email, marketing, website

Substack

Publishes posts
Hosts newsletter pages
Supports links and buttons

email, marketing, website, sdk

Flodesk

Sends email
Runs automations
Custom HTML blocks

Common setup

Most teams use Substack as their email layer and Flodesk as their email layer, with Plandalf in the middle handling the checkout, Offers, invoices, integrations, and the events that fire after a purchase.

See Substack and Flodesk docs for connection details.

Open app pair page Read the docs

Product surfaces behind this integration

This legacy integration URL now points builders toward the same product reality as the canonical app-pair guide: Offers, payment options, invoices, integrations, Automations, API docs, and webhooks.

The Numi offer editor showing layout, product, theme, automation, invoice, and settings controls.

The offer record connects the stack

Use Offers to define the product, price, checkout mode, invoice, and automation context before Substack and Flodesk receive events.

Offers Products Prices Invoices

The Numi offer editor automation tab showing sequence controls beside the checkout canvas.

Purchase automation carries the details

Automations and webhooks let Substack and Flodesk receive buyer, product, payment, invoice, coupon, and deadline context.

Automations Sequences Webhooks Webhook fanout

The Numi integrations settings page showing Stripe, PayPal, TaxJar, and Avalara connection options.

Integration settings remain visible

Confirm Stripe, PayPal, TaxJar, Avalara, and test-mode routing before sending the Substack and Flodesk path live.

Integrations Stripe PayPal Tax platforms

Use the richer guide from here

Keep moving from this page into canonical integration docs, platform pages, stack guides, and sequence recipes so every Substack or Flodesk mention has a useful next step.

Open canonical app-pair guide Use the richer Substack and Flodesk implementation guide. Substack platform page Roles, capabilities, and setup notes for Substack. Flodesk platform page Roles, capabilities, and setup notes for Flodesk. API-first stack SDK checkout, API keys, webhooks, payment processors, and invoices.