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Fill in all required fields (RED MARK). In this example we have only one required field, another API method can have other fields. As a value in the field you can use static data (number, string, etc.) or Hashtags as a dynamic data source (in the Hashtags article you can learn what the #application:id# reference does).
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It can be very useful when you are using the same API method in different use-cases. For example, in one app you want to update field "Address", in another app (or in the same app) you need to update field "MainAdress" etc.
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