Authentication

Every API request must include your API key. Here's how to authenticate.

API key

Create API keys in your dashboard. Keys start with ms_live_ for production and ms_test_ for sandbox.

Pass your key via the X-API-Key header (recommended) or as a Bearer token:

# Recommended
X-API-Key: ms_live_your_key_here

# Also works
Authorization: Bearer ms_live_your_key_here

Keep your key secret. Don't commit it to version control or expose it in client-side code. If a key is compromised, revoke it in the dashboard and create a new one.

Key management

The number of active API keys depends on your plan:

Free: 1 key
Starter: 3 keys
Pro: 5 keys
Business: 5 keys
Enterprise: unlimited

You can create, view, and revoke keys from the API Keys tab in your dashboard. Once created, the full key is shown only once — copy it immediately.

← Sandbox mode

Verify endpoint →