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Yes // The URL that gateway callback requests should be directed to Configure::set("Blesta.gw_callback_url", "http" . (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != "off" ? "s" : "") . "://" . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : "localhost") . WEBDIR . "callback/gw/"); The above bit (already preexisting in your /config/blesta.php) allows for it to be routed correctly when the request is made.

You could manage each individual service and UNSELECT 'Use Module' while removing the service to remove without using API (i.e remove just from Blesta side). Once there are no active services / invoices you should be able to remove the client as expected

Thanks for handling Mike.