Application
The boundary that owns API keys, environments, messages, and webhook endpoints.
Get started
Fabric is a server-side communications API for SMS and email. The fastest path is to create an application, use its sandbox key, and send a published message definition by key.
Core concepts
Section titled “Core concepts”Environment
Every application has isolated sandbox and live activity. A key’s prefix selects the environment.
Message definition
A versioned SMS or email template addressed by a stable key such as welcome.otp.
Delivery
One send attempt, its state, rendered preview, cost, and webhook history.
Key prefixes
Section titled “Key prefixes”| Prefix | Environment | Recipients | Wallet |
|---|---|---|---|
sk_test_ |
Sandbox | Virtual only | No real charge |
sk_live_ |
Live | Real provider delivery | Funds required |
The SDK infers the environment from the key prefix. It rejects any other secret-key format before making a network request.
- Create an application. In the Fabric dashboard, create the application that will own this integration.
- Create a sandbox key. Copy it once and store it in your server-side secret manager as
FABRIC_API_KEY. - Publish a message definition. Give it a stable key and add the variables your application will supply.
- Send from your server. Follow the Node.js quickstart.
- Add a webhook. Treat the signed terminal event as the source of truth for delivery.
Keep reading
Section titled “Keep reading”Sandbox & test keysWhat the zero-gate sandbox does and does not simulate.
AuthenticationHow keys are passed, how the environment is chosen, and the server-only rule.