Developer documentation

Build commerce on the order, not the charge

Orders, payments, subscriptions, and invoices on one API. Start from a quickstart, then drill into field-level reference when you need it.

Start with the quickstart Browse the API reference

Test card

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Any future expiry, any CVC. Works on every test-mode checkout. See Testing for declines and 3D Secure.

Accept your first payment

Order to completed test payment in four API calls.

Use the Node SDK

Typed Node.js and TypeScript client for server-side work.

Embed payments in your UI

Stripe Elements in your own checkout, from order to charge.

Run recurring billing

Plans, subscriptions, and renewal handling.

Build with AI agents

SKILL.md, the OpenAPI spec, and agent-ready endpoints.

Test before go-live

Sandboxes, test cards, and simulated failures.

Guides

Task-based guides for each part of the integration.

Browse all guides

Get started

The shortest path to a test payment.

Overview

Accept Your First Payment

Sandboxes & Test Mode

Authentication

Payments

Orders, embedded payments, and hosted checkout.

Why Flint Is Orders-First

Embedded Payments with Stripe Elements

Checkout Sessions

Payment Links

Reliability

Webhooks, retries, and failure handling.

Operations

Run Flint in production: money movement and disputes.

Reconciliation

Disputes

Statuses & Lifecycles

Migrations

Migrating from Stripe

Migrating from Square

AI & agents

Build agentic and headless integrations on Flint.

LLM Integration

MCP Server

API & Agent Onboarding

API reference

Every resource, endpoint by endpoint, with request and response shapes.

Open the reference

Build commerce on the order, not the charge

Guides

Get started

Payments

Reliability

Operations

Migrations

AI & agents

API reference

Core commerce

Fulfillment

Payments

Subscriptions

Events & logs

Account & platform