Include the following request headers on every API call:

X-TagBee-PubKey API Public Key
X-TagBee-Signature Base64 encoded string generated using HMAC-SHA256 and the Private Key acquired during the project creation
X-TagBee-PubKey generation PHP example
            $jsonPayload = '{"string": "Hello World"}'; 
base64_encode(hash_hmac('sha256', $jsonPayload, $tagBeeSecretKey, true));
You don't have your access keys yet? Register to TagBee, create your first project and get a Public and a Private key.