Authentication

The authentication is done passing your API token associated with your pro plan as x-api-key request header.

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You can ensure your authentication is done correctly checking the x-pricing-plan header on the response.
If you need to consume the API from a frontend side (e.g, from a website), don't attach your API token directly in your client code: It will easy to a visitor leak it and consume your API quota without consent.
Instead, you need to setup a mechanism to just allow consume your token for a allowed list of trusted domains.
Check our repositories and to accomplish that, only allowing a list of well-known domains to consume your API quota.