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If you can see an API here - you can subscribe to it by clicking the "subscribe" button on the left. By clicking the subscribe button to the left you can choose which subscription plan you would like to subscribe with. These choices are made available throught the API definition.
After subscribing to an API you will be able to try the API (currently only open API versions).
By clickint "Try API" on the right the swagger API for this API will open, the API key and client secret from the application will be set and you will be able to call the API and test it out.
API Explorer
In the API Explorer you are able to explore the API's available to your chosen partner. The API's available are defined through the administration console and the setting of the individual API's. Contact an API administrator if you are missing an expected API. You will also be able to see if an API is deployed or not.
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By clicking on the "API version information" link to the right, you can see available information on the API - including description, tags, and which environments the API is deployed to.
Profile and sign out
<fill in stuff>The last two menu items allows you to change your profile information, including your password, as well as deleting your developer profile from the system. If you delete the developer profile from the system you will not be able to manually create a developer again, as your email will be stored in the system as deleted - untill an administrator removes it completely.
