# Build with the Medsender API

Sign up to try the Medsender API in minutes. Create test keys, provision fax numbers, send your first fax, and run our AI on incoming faxes.

## What you can build

Use one API to send and receive faxes, provision and manage fax numbers, create secure email links for document delivery, and organize workflows around clients. AI document processing can classify documents and extract useful fields, while webhooks notify your application when fax, email, and AI jobs complete. These capabilities support practical healthcare document workflows without requiring a team to assemble separate point solutions.

## How it works

Authenticate requests with a self-contained Bearer API key. Test keys and live keys are separate, so developers can build against sandbox data before moving a workflow into production. The API documentation includes endpoint details, request parameters, response fields, examples in multiple languages, and callback payloads. Start with authentication, choose the capability your integration needs, then use delivery status and webhooks to keep the rest of your system synchronized.