anyone tell me how can i get the data I m using HHTPcaller how can I get the Columns
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You'll need to add a little more information to your question. What does the response look like for the HttpCaller?
Your question is quite hard to answer without more context, but I suspect you will find the answer in the article Authenticating and Extracting Information from API calls with the HTTPCaller.
Careful, the client_secret is in this link and this is an open forum.
The response is JSON, see attachment. I can't help you because it is a data structure, not a table, so there are many pieces you can get from this in many different ways.
You can parse this using a JSON FeatureReader or do it manually using JSONFragmenters, JSONFlatteners and JSONExtractors.
A good start is Tutorial: Getting Started with JSON
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