Plandalf
← Custom API integrations

Integration pair

Connect Custom API and Klaviyo

Start with Custom API and connect it to Klaviyo: Use Custom API and Klaviyo together in a Plandalf checkout and post-purchase workflow. Plandalf keeps checkout, offer data, buyer records, and follow-up events aligned.

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sdk

Custom API

Custom API participates in this Plandalf integration path.

Plandalf

Commerce workflow

Offers, Timers, checkout data, payment context, invoices, entitlements, and events.

email, marketing, website, sdk

Klaviyo

Klaviyo participates in this Plandalf integration path.

Setup pattern

One checkout event, multiple systems updated

  1. 1. Define the offer and buying surface - Build the offer, product, price, coupon, order bump, upsell, invoice, and checkout mode in Plandalf before Custom API or Klaviyo receives data.
  2. 2. Connect the app roles - Use Custom API for its sdk role and Klaviyo for its email role, with Plandalf carrying the commerce context between them.
  3. 3. Route the purchase event - Send buyer, product, payment, invoice, deadline, coupon, and fulfilment state into webhooks, API handlers, or sequences after checkout.
  4. 4. Keep the operator controls visible - Confirm integrations, payment options, test mode, tax settings, invoices, and automation settings in the app before sending traffic live.

Related searches

More Custom API connections

Custom API + PayPal Custom API + Stripe Custom API + Drip Custom API + Kit (ConvertKit) Custom API + Mailchimp Custom API + Next.js

Product screens that matter for this integration

The useful version of a Custom API and Klaviyo integration is not just an app directory card. It shows the Plandalf screens where Offers, payment options, invoices, integrations, Automations, and API handoffs are actually configured.

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

Offer configuration is the source of truth

The Custom API and Klaviyo integration should start from the offer record: product, price, checkout mode, invoice, and automation context.

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

Automation receives commerce context

Custom API and Klaviyo should receive a purchase event with buyer, product, invoice, coupon, and deadline context, not a bare notification.

AutomationsSequencesWebhooksWebhook fanout
The Numi offer editor showing hosted checkout mode controls.

The checkout launch point is explicit

Use hosted checkout, embedded checkout, buy buttons, or SDK checkout depending on where Custom API and Klaviyo sit in the stack.

Hosted checkoutBuy buttonSDK checkoutAPI-first stack

Keep these references open

Use these Plandalf pages when building the Custom API and Klaviyo path so every feature, integration, sequence, and API handoff has a next click.

Custom API platform page Roles, capabilities, and setup patterns for Custom API. Klaviyo platform page Roles, capabilities, and setup patterns for Klaviyo. API-first stack SDK checkout, API keys, webhooks, payment processors, and invoices together. Checkout completed fulfilment A sequence recipe for fulfilment after a successful purchase.

Feature detail