clear credit cards

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I made PLUGIN to clear credit cards for WordPress for the PLUGIN WOOCOMERCE
At the end of the transaction the landing page of clearing calls to the store’s URL for success or failure
From the new versions 4.9 I get 0 when I call the page
Do you have an idea of what and what should I do?
I call to
‘ReturnURL’ => get_site_url (). ‘/wp-admin/admin-ajax.php?action=done_payment&orderid=’.$order_id,