WC Authorize.net CIM: On the payment form, default "securely save to account" checkbox to checked

wc-auth-net-cim-save-payment-method-default-checked.php

<?php
// force the "securely save to account" checkbox to default to checked
function wc_auth_net_cim_save_payment_method_default_checked( $html, $form ) {

	if ( empty( $html ) || $form->tokenization_forced() ) {
		return $html;
	}
	
	return str_replace( 'type="checkbox"', 'type="checkbox" checked="checked"', $html );
}
add_filter( 'wc_authorize_net_cim_credit_card_payment_form_save_payment_method_checkbox_html', 'wc_auth_net_cim_save_payment_method_default_checked', 10, 2 );