Upload the folder (cancel_service) in path modules/addons.
Add the following code at the end of the language files.
# Cancel Service
$_LANG['error_notice'] = "Cancellations for this service must be submitted no later than";
$_LANG['error_notice1'] = "days prior to your next due date which is";
$_LANG['product_details'] = "Back to Product Details";
The activate, check who has access and add the License key in Admin whmcs.
Immediately after going Addons choose the Cancel Service and begin the settings.
And the mod is ready!
