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FossaPay provides two official JavaScript and TypeScript SDKs. Use the Node SDK for server-side money movement and the Checkout SDK when customers need to complete a hosted checkout.

Node SDK

Create customers and wallets, collect payments, inspect transactions, resolve bank accounts, send individual payouts, and verify webhooks from a trusted server.

Checkout SDK

Create payment links or one-time checkouts on your server, then present the hosted checkout as a modal, inline frame, redirect, or new tab.

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Choose an SDK

You can install both packages in the same application. A common integration uses @fossapay/checkout/server to create a checkout in a protected backend route and @fossapay/checkout or @fossapay/checkout/react to open the returned URL in the browser.
Never expose a FossaPay API key in browser code. Only the browser and React exports from the Checkout SDK belong in your frontend bundle.

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Install

Both packages include TypeScript declarations and support ES modules and CommonJS.

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Get help

Before contacting support, include the package name and version, the operation being called, the HTTP status, the FossaPay request ID when available, and a redacted error response. Never include API keys, webhook secrets, or complete customer financial details.

Contact FossaPay support

Send SDK integration questions to product@fossapay.com.