# Paddle Developer Docs — SDKs and tools

> Official SDKs, sandbox, AI and MCP servers, specs, starter kits, and community libraries.

For the complete documentation index, see [https://developer.paddle.com/llms.txt](https://developer.paddle.com/llms.txt).

- [Docs MCP server](https://developer.paddle.com/sdks/ai/docs-mcp.md): Connect AI agents to current Paddle documentation, the OpenAPI specification, and SDK references using the Paddle docs MCP server.
- [Next.js starter kit](https://developer.paddle.com/sdks/starter-kits/nextjs.md): Production-ready Next.js SaaS starter kit with Paddle Billing, Supabase auth, and Vercel deployment. Includes a localized pricing page, integrated checkout, and customer subscription management screens.
- [Node.js SDK](https://developer.paddle.com/sdks/libraries/node.md): Install, authenticate, and make your first request with the official Paddle Node.js SDK for server-side JavaScript and TypeScript.
- [OpenAPI spec](https://developer.paddle.com/sdks/specs/openapi.md): Download the Paddle OpenAPI specification to generate client libraries, power editor tooling, or import into API exploration tools.
- [Pay gem (Ruby)](https://developer.paddle.com/sdks/community/pay-gem.md): Community-maintained Ruby on Rails gem that provides an abstraction over Paddle Billing alongside other payment processors.
- [Pricing display](https://developer.paddle.com/sdks/components/pricing-display.md): Full pricing section with localized prices, an interval toggle, and Paddle overlay checkout on selection.
- [Sandbox](https://developer.paddle.com/sdks/sandbox.md): Build and test your Paddle integration in a risk-free environment with separate data and no real payments.
- [Laravel Cashier Paddle](https://developer.paddle.com/sdks/community/laravel-cashier.md): Official Laravel package that provides a fluent interface to Paddle Billing subscription services, including swaps, pausing, quantities, and grace periods.
- [Paddle MCP server](https://developer.paddle.com/sdks/ai/paddle-mcp.md): Give AI agents access to your Paddle account so they can read data and take actions across pricing, billing, and integration workflows.
- [Postman collection](https://developer.paddle.com/sdks/specs/postman.md): Import the Paddle Postman collection to explore and test the Paddle Billing API interactively.
- [Pricing cards](https://developer.paddle.com/sdks/components/pricing-cards.md): Tier cards with localized pricing, feature lists, and selection or current-plan states.
- [Python SDK](https://developer.paddle.com/sdks/libraries/python.md): Install, authenticate, and make your first request with the official Paddle Python SDK.
- [Web monetization starter kit](https://developer.paddle.com/sdks/starter-kits/web-monetization.md): Production-ready Next.js starter kit for monetizing iOS apps on the web. Includes a customizable landing page, pricing page, paywall, and integrated Paddle Checkout, designed to meet platform approval requirements.
- [Agents and AI](https://developer.paddle.com/sdks/ai.md): MCP servers, Agent Skills, and embedded docs AI — tools that let AI agents integrate, operate, and reason about Paddle.
- [Go SDK](https://developer.paddle.com/sdks/libraries/go.md): Install, authenticate, and make your first request with the official Paddle Go SDK for server-side Go applications.
- [next-forge](https://developer.paddle.com/sdks/community/next-forge.md): Production-ready Next.js boilerplate with a pluggable payments package that supports Paddle Billing.
- [Pricing select cards](https://developer.paddle.com/sdks/components/pricing-select-cards.md): Compact, selectable plan cards in a radio-group pattern. Stacked or grid layout.
- [Skills and plugins](https://developer.paddle.com/sdks/ai/agent-skills.md): Drop-in instructions that teach AI coding agents how to integrate Paddle, including catalog setup, checkout, webhooks, subscription sync, pricing pages, and sandbox testing.
- [Billing interval toggle](https://developer.paddle.com/sdks/components/billing-interval-toggle.md): Segmented toggle for switching between billing intervals, like monthly and yearly.
- [Libraries](https://developer.paddle.com/sdks/libraries.md): Official Paddle server-side SDKs for Node.js, Python, Go, and PHP, plus the Paddle.js wrapper for client-side JavaScript and TypeScript.
- [PHP SDK](https://developer.paddle.com/sdks/libraries/php.md): Install, authenticate, and make your first request with the official Paddle PHP SDK.
- [Express checkout](https://developer.paddle.com/sdks/components/express-checkout.md): Mobile-first checkout block with plan selection and a drawer-style payment flow.
- [Paddle.js wrapper](https://developer.paddle.com/sdks/libraries/paddle-js-wrapper.md): Install the Paddle.js wrapper to load Paddle.js using a JavaScript package manager, with full TypeScript definitions.
- [Specs and collections](https://developer.paddle.com/sdks/specs.md): OpenAPI spec and Postman collection for the Paddle Billing API.
- [Inline checkout](https://developer.paddle.com/sdks/components/inline-checkout.md): Full inline checkout experience with a live order summary that stays in sync as the customer changes plans.
- [Starter kits](https://developer.paddle.com/sdks/starter-kits.md): Production-ready starter kits you can deploy to Vercel and customize to build on top of Paddle.
- [Checkout summary](https://developer.paddle.com/sdks/components/checkout-summary.md): Complete order summary with line items, subtotal, tax, and recurring billing details. Included as part of the inline checkout component.
- [Community](https://developer.paddle.com/sdks/community.md): Third-party libraries and frameworks that integrate with Paddle Billing, maintained by the community.
- [Paddle UI](https://developer.paddle.com/sdks/components.md): Drop-in React components for billing and subscription management. Install using the shadcn CLI.
- [SDKs and AI tools](https://developer.paddle.com/sdks.md): Official SDKs, sandbox, AI and MCP servers, specs, starter kits, and community libraries for building with Paddle.
- [Subscription status card](https://developer.paddle.com/sdks/components/subscription-status-card.md): The main billing card for a customer account page. Includes plan, status, discount, scheduled changes, and action buttons.
- [Subscription alert](https://developer.paddle.com/sdks/components/subscription-alert.md): Status-aware alert banners that surface the right message based on subscription state.
- [Subscription payment card](https://developer.paddle.com/sdks/components/subscription-payment-card.md): A customer's next payment date, amount, and the payment method on file, with option to update the payment method.
- [Plan change preview](https://developer.paddle.com/sdks/components/plan-change-preview.md): Compact confirmation summary for a plan change. Includes the old and new plan, whether the customer is charged or credited, and when the change takes effect.
- [Plan change breakdown](https://developer.paddle.com/sdks/components/plan-change-breakdown.md): Full invoice-style financial breakdown for a plan change, including line items, proration, discounts, tax, and totals.
- [Core components](https://developer.paddle.com/sdks/components/foundation.md): Shared types, formatters, and the Paddle.js client helpers that every Paddle UI component depends on. These come bundled with other components, so you don't need to install them directly.