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We seem to be getting errors like the one below, caused by this plugin
PHP Deprecated: get_used_coupons is deprecated since version 3.7! Use WC_Abstract_Order::get_coupon_codes instead.
As the error states, the plugin uses a function that has been deprecated.
That code can be found at
woocommerce-conversion-tracking\includes\integration.php Line 307
and
woocommerce-conversion-tracking\includes\integrations\class-integration-custom.php Line 121