Developers

Build on Simsfer

Integrate supported Simsfer services into your product using simple APIs, sandbox environments, webhooks and developer tools.

Start with one authenticated request

Every request is authenticated with an environment-scoped key. Sandbox keys are issued after your application is approved. Base URL and endpoints shown here are placeholders until the specification is published.

Never share a secret key. Documentation examples always use placeholders such as sk_sandbox_xxxxxxxxx.
curl https://api.simsfer.com/v1/ping \
  -H "Authorization: Bearer sk_sandbox_xxxxxxxxx"
Developer features

Everything you need to evaluate quickly

REST APIs

Predictable resources, JSON payloads and request IDs on every response.

Sandbox Environment

An isolated environment that never touches production systems.

API Keys

Environment-scoped keys you can name, rotate and revoke.

Webhooks

Signed event delivery with retries and delivery history.

Test Data

Deterministic test values to trigger success, failure and pending states.

Request Logs

Search requests by endpoint, status, request ID and response time.

API Documentation

Reference generated from the API specification, with copyable examples.

Production Access

A separate review before live credentials are issued.

Sandbox

Test scenarios that behave predictably

The sandbox simulates Simsfer APIs without affecting production systems, and is clearly labelled SANDBOX throughout.

Successful activation
Failed activation
Pending activation
Successful gift-card order
Failed order
Webhook delivery
Invalid request
Insufficient test balance