Using the Greenspark API requires each request to have a
X-API-KEY header containing a Greenspark API key.
It is essential to handle your Greenspark API key as a secret and not to publish it anywhere, since otherwise your data could be accessed and you could be charged for usage.
Using the Widget API requires each request to have a
X-API-KEY header containing a Widget API key.
You can embed your Widget API key into your application and publish it safely, since it's only used with endpoints providing public data.
Create your API keys
For an overview on how to create your Greenspark API & Widget API keys head to the How it works section.