Welcome to Fynn API documentation! This guide is designed to streamline the integration process and provide you with all the necessary resources to seamlessly incorporate Fynn into your systems. Whether you’re managing subscriptions for a SaaS platform, digital content, or any other recurring billing needs, our API aims to simplify complex billing operations, empowering you to focus on your core business.
Sandbox environment
Before you start integrating with the Fynn API, you can test your application in a sandbox environment, where you can create and manage subscriptions without any financial implications.Contact our support team to get access to the sandbox environment.
The Fynn API is organized around REST. Our API has predictable resource-oriented URLs, accepts JSON-encoded request bodies, returns JSON-encoded responses, and uses standard HTTP response codes, authentication, and verbs.

​
Endpoints

We provide the following endpoints:
  • Production:
    • API: https://coreapi.io
    • Frontend: https://app.fynn.eu
    • Customerfront: https://customerfront.app
  • Playground:
    • API: https://preview.coreapi.io
    • Frontend: https://preview.fynn.eu
    • Customerfront: https://preview.customerfront.app
Customerfront
The customerfront.app serves any customer-facing pages, such as the customer portal, checkout, and offer pages.