@klappay/oneThe embeddable Klappay payment button

Drop it on any page — it opens a modal or popup that handles identity, wallet connection, and payment approval entirely on Klappay's own origin, then reports the result back to you.

Getting started

GitHub

Zero-JS drop-in

or a plain

Programmatic API

createKlappayOne(config).open() for full control over when the checkout opens and how results are handled.

React

A thin wrapper and a useKlappayOne() hook — no separate implementation, both call straight into the same core.

Any other framework

The core is a framework-agnostic Web Component — Vue, Svelte, Angular, or plain HTML all use the exact same element.

iframe or popup, picked for you

Desktop defaults to an iframe/modal, mobile to a popup — with an automatic iframe-to-popup fallback if a merchant CSP blocks the frame.

Never a proof of payment

onSuccess is a UX signal only — real fulfillment comes from Klappay Core's charge.confirmed webhook. The docs explain exactly why.