To implement, simply put your user name (email address) and Secret API key in the Authorization header on each API request.
Your API key is a Secret Password! Do not share this key with anyone, including TPA Stream. TPA Stream will NEVER ask for your Secret API Key.
A simple example using curl:
curl -L --user firstname.lastname@example.org:MY_API_KEY https://app.tpastream.com/api/claims