If you have access to the Account Analytics page you can also access the Data API reports via the dashboard. This is done via the ‘Custom Reports’ button at the top right of the page.
These ‘Custom Reports’ are part of the Data API feature and will automatically become available to you when the Data API feature is enabled for your account.
Via the ‘Custom Reports’ you can select the same type of reports that are available via the Data API and specify a date range for the report you want to download.
The CSV report downloaded via the ‘Custom Reports’ option is in the exact same format as if you were using the Data API. This can either be used as a tool to test what your data would look like, or you can use it instead of/in combination with the Data API to manually download your required reports.