You need to enter a start date in the URL, like this: https://api.thebamcompanies.com/copper-deduplicate.php?start_date=YYYY-MM-DD.
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    You can also include an end date like this: https://api.thebamcompanies.com/copper-deduplicate.php?start_date=YYYY-MM-DD&end_date=YYYY-MM-DD.