Hey There, I have installed the express checkout client-side-only. The transaction is working, and then it redirects to the success page, passing the transaction details by GET. I would like to make a query from the server (in PHP) to double check that the data has been transferred without alteration. I tried the IPN in the sandbox, but it seems not to be available anymore because I cannot find it on the dashboard and it is not in the app settings for REST API. There is the webhook, but I am not sure yet how to access it with a sandbox. Can you guys help me secure that? Thanks! <removed>
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