Hosted checkout in 2 minutes. Custom integration in a day.
A clean REST API, four official SDKs, and a sandbox with test cards. Built by developers, for developers.
Create a payment in 4 lines.
Pick your language. The same operation, in every supported SDK.
curl https://api.fyber.one/v1/charges \
-u sk_test_...: \
-d amount=25000 \
-d currency=jmd \
-d source=tok_visa \
-d description="Charge for test@example.com"From drop-in to fully custom.
Hosted checkout
Drop-in payment pages — no integration required.
Payment links
Shareable URLs, branded, with custom slugs.
Custom checkout
Build your own UI with our card capture endpoints.
Subscriptions
Recurring billing with proration and dunning.
BNPL / Installments
Schedule, cadence, retries — all configurable.
Webhooks
Signed event delivery with retries.
Predictable. Documented. Versioned.
Six principles every endpoint follows. No surprises in production.
REST + JSON
Predictable HTTP verbs, JSON in and out, ISO 8601 timestamps, ISO 4217 currencies.
Idempotency keys
Pass an Idempotency-Key header on POSTs. Safe to retry — same key returns same response.
Cursor pagination
List endpoints use cursor-based pagination. Use the next_cursor in the response to fetch the next page.
Signed webhooks
HMAC-SHA256 over the request body. Verify with your webhook signing secret before processing.
Versioning
API version is in the URL (/v1). Breaking changes ship as new versions; old versions are supported for 12 months.
Rate limits
Per-key, per-endpoint. 429s come with a Retry-After header. We email you well before you hit a limit.
Four official SDKs.
Same API surface in every language. Type definitions included.
JavaScript / Node
Works in Node 18+ and modern browsers. TypeScript-first.
npm i @fyber.one/sdk-js
PHP
PHP 8.1+. Composer package on Packagist.
composer require fyber/sdk-php
.NET
.NET 8+. NuGet package, full async/await.
dotnet add package Fyber
Flutter
Dart 3+. Mobile and web. Hosted checkout WebView helper included.
flutter pub add fyber
Everything else you might want.
Full API reference
docs.fyber.one — every endpoint, every parameter.
Sandbox
Test card numbers, simulated webhooks, instant access.
Changelog
What shipped, what's deprecated, what's next.
Status
Live platform status and incident history.
Developer support
Email dev@fyber.one — real engineers reply.
GitHub
Open-source SDKs and example apps.
Build your first integration in an afternoon.
Test API keys are free. The sandbox is always live.