# Headers

Request conventions for the messaging REST APIs: Bearer API key, JSON bodies, UUIDv4 ids and ISO 8601 UTC timestamps.

## Authentication

{% hint style="info" %}
Authentication is done by passing your TSG Global API key via the Authorization header in the format "Authorization: Bearer \<api\_key>"
{% endhint %}

## Parameters & Content-Type

Parameters should be JSON encoded and passed in the request body (with the Content-Type header set to `application/json`). IDs are always UUIDv4. Timestamps are in the ISO8601 format and in UTC.

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