Important to notice is that we supply two different APIs. One is for customers that sign up via our customer site and that is only for creating and editing instances. The other API which is on our Console, is for all customers, regardless if signed up via our Customer site or any or our providers. That API is for managing settings for your cluster, for example, setting alarms, enable integrations and more.
Because there are two different APIs there are also different API keys to them. For the Console API you can find the key on the details page for your cluster, next to the API key you can also find the link to to documentation for that API. For the Customer API you can find the API key under API Access page in the dropdown menu in the header.
Documentation for the customer API can be found here: https://docs.elephantsql.com
Documentation for the console API can be found here: https://docs.elephantsql.com/elephantsql_api.html