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Cart, Order, and Refund State

Payments API That Keeps Cart, Order, and Refund State in Sync

A payments API for teams that want checkout, payment, and refund flows to stay attached to one durable sale record instead of fragmenting across cart, charge, and support systems.

Flint treats the order as the durable business record, so checkout, payment intent, hosted collection, invoices, and refunds can all refer back to the same sale instead of forking state.
The current balance, paid amount, refunded amount, and later invoice conversion can stay on one workflow instead of forcing the app to reconcile a cart system, a payment system, and a post-purchase ledger.
Hosted checkout, embedded payments, and invoice conversion all use the same order-backed balance model, which reduces the number of places state can drift.

Workflow Outline

01

Your cart, checkout, payment, and refund records keep drifting apart, and support has to reconstruct what actually happened later.

02

The buyer can pay through different surfaces, but the team still wants one durable sale record that survives beyond the original checkout attempt.

03

Refunds, invoice conversion, and hosted recovery all need to attach to the same workflow record instead of forking state into separate ledgers.

What This Solves

Teams searching for a payment API that keeps cart, order, and refund state in sync usually already know the problem: checkout succeeds, but later support and finance work lives on different records that keep drifting apart.

Step 1

One sale record after checkout

Keep the order alive after payment so hosted checkout, embedded pay, refunds, and later invoice conversion all point back to the same workflow.

Step 2

Balance-aware recovery flows

When payment is partial, interrupted, or later converted into an invoice, keep the remaining balance attached to the same order record.

Step 3

Refunds that do not fork state

Let refunds update the same order-backed workflow instead of creating a processor refund that support then has to reconcile manually.

Step 4

Support and finance on one history

Give operators one record that shows what was sold, paid, refunded, and still collectible without cross-checking many systems.

Why Flint Fits

Flint treats the order as the durable business record, so checkout, payment intent, hosted collection, invoices, and refunds can all refer back to the same sale instead of forking state.
The current balance, paid amount, refunded amount, and later invoice conversion can stay on one workflow instead of forcing the app to reconcile a cart system, a payment system, and a post-purchase ledger.
Hosted checkout, embedded payments, and invoice conversion all use the same order-backed balance model, which reduces the number of places state can drift.

Choose Another Path When

Use the server-computed totals page when the main problem is authoritative amounts and balance math rather than full workflow synchronization.
Use hosted checkout or payment-link pages when the current architecture decision is only about buyer-facing collection surfaces.
Use refunds-specific pages when the pain is mostly post-purchase adjustment logic rather than the whole cart-to-refund state model.

Next Step

Ship the workflow before polishing the edge cases

Start with the underlying Flint flow, then layer your product-specific UX and recovery paths on top.