If another system's integration setup step instructed you to connect their application to Planday and provided you with an application ID, you can enter it by navigating to Settings > API access > Connect App button.
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Once you insert the application ID provided by the other system and click Save, the app will appear in your application list. To obtain the application's token, click Authorise, review the permissions you're providing to the application, and confirm by clicking Authorise again.

The easiest way to access Planday's Open API is by creating a new API application. Go to Settings > under the Integrations section, click API Access > click Create App.
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Add your application's name to the title field and then use the scopes below to determine the data accessible through API using the application's credentials. Once you've made your choice, click Save.
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Your new application will show in the application list. The last step is to grant the application access to your data using the Authorise button, then confirm your selected scopes. The application is now authorised, and you can use the credentials on the tile.
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If you wish to set up the application on several Planday organisations, follow the chapter Connect an Open API app with a known Application ID using the APP ID of the application you just created.
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When you deactivate an admin’s account who previously authorised any of your Open API applications, the systems using these credentials will lose access to your Planday data. This is a security measure to keep your data safe.
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To reauthorise the Open API applications, open the Settings page, select API access in the left menu and locate affected applications.

Next, Authorise the application again and confirm its permission scopes.

A new token is going to be generated for the application. You must update the new token value in all systems using the Open API application to access your Planday data.