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Essentially, you'll create a module with an ACT URL. (https://docs.expressionengine.com/v2/development/modules.html).
You'll have your mod.module_name.php file, which will contain your logic to retrieve the data and enter it into the database using the Database Class (https://docs.expressionengine.com/v2/development/usage/database.html).
Then in you're upd....
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