Firstly you have to signup and create an account. Now you are able to create an API-Key and to subscribe to a pre-defined or custom plan.

Choose a plan. Go to your dashboard and select a pre-defined or custom plan. After subscribing you are able to make requests to every endpoint. But keep in mind, only 100 requests per hour are possible.

Generate an API-Key. This key is an unique and personal identifier to authorize every request you will make to the endpoints. But without subscribing to a pre-defined or custom plan you will only get a 401 (not autorized) response or an empty object.

Congratulations. Now you are able to use all proxies and endpoints. Just begin to get your subscriptions for your subscription_ID for further proxy-related requests.