Everything you need to integrate Fyneri into a Shopify store, a custom React app, or a server-only flow. Five SDKs, one REST API, one webhook signature scheme. No bespoke vocabulary — if you've used Stripe before, you'll feel at home.
Drop in our hosted checkout, redirect from your store, and process a test transaction. No SDK required.
Read quickstart → React · embeddedUse our React components to render checkout inside your own pages with full theming control.
Read guide → Server-sidePOST to /v1/checkout_sessions from your backend. Receive a checkout URL or client secret.
Create a price, attach it to a customer, and Fyneri handles renewals, retries, dunning, and proration.
Read guide → WebhooksSubscribe to payment.succeeded, refund.created, and 30+ event types. HMAC-SHA256 signed.
Most direct Stripe integrations can be migrated in under an hour. We re-use your existing PaymentMethod and Customer objects.
Read guide →Server-side, using the Node SDK. This creates a Checkout Session and returns a hosted URL you redirect the customer to.
Under the hood Fyneri creates a Stripe Checkout Session on your connected Stripe account, layers our analytics/automation hooks on top, and returns a single URL. Your Stripe Dashboard remains the source of truth for the underlying transaction.
All SDKs are MIT-licensed and open-source. Beta status until v1.0 GA — breaking changes will be called out in the changelog with at least 30 days notice.
POST /v1/checkout_sessions
Create, retrieve, list, expire.
POST /v1/payment_intents
Confirm, capture, cancel, refund.
POST /v1/customers
Manage payment methods, addresses.
POST /v1/subscriptions
Trials, proration, retries.
Verify signatures, list events, replay.
30+ event types supported.
Full or partial refunds; dispute evidence submission via API.
View endpoints →