Before you start developing your API, you must start the API Designer.
To start the API Designer
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Go to the installation path for API Designer. 
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Run the ApiDesigner.Editor.exe application. The API Designer opens. 
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Perform one of the following tasks: - 
To use an existing connection to the One Identity Manager database, select it in the Select a database connection menu. 
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To create a new connection to the One Identity Manager database, click Add new connection and enter a new connection. 
 
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Select the authentication method and enter the login data for the database under Authentication method. 
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Click Connect. 
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In the Select project save type dialog, perform one of the following tasks: - 
Click Database project to save the project in the database. 
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Click Solution project to save the project within a solution. TIP: For more information, see Project types. 
 
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(Optional) To save the selected storage type for future projects, select the Use selected project as default option. 
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Click OK. The API Designer opens and displays the start page. 
