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Editing: form-billing.php

<?php
/**
 * Checkout billing information form
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/checkout/form-billing.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see     https://docs.woocommerce.com/document/template-structure/
 * @package WooCommerce/Templates
 * @version 3.6.0
 * @global WC_Checkout $checkout
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/** @global WC_Checkout $checkout */

?>
<div class="woocommerce-billing-fields">
	<?php if ( wc_ship_to_billing_address_only() && WC()->cart->needs_shipping() ) : ?>

<?php else : ?>

<?php endif; ?>

<?php do_action( 'woocommerce_before_checkout_billing_form', $checkout ); ?>

<div class="stm-billing-fields woocommerce-billing-fields__field-wrapper">
		<?php
		$fields = $checkout->get_checkout_fields( 'billing' );

foreach ( $fields as $key => $field ) {
			if ( isset( $field['country_field'], $fields[ $field['country_field'] ] ) ) {
				$field['country'] = $checkout->get_value( $field['country_field'] );
			}

if ( apply_filters( 'stm_is_auto_parts', false ) ) {
				$field['placeholder'] = $field['label'];
			}

woocommerce_form_field( $key, $field, $checkout->get_value( $key ) );
		}
		?>
	</div>

<?php do_action( 'woocommerce_after_checkout_billing_form', $checkout ); ?>

<?php if ( ! is_user_logged_in() && $checkout->is_registration_enabled() ) : ?>

<?php if ( ! $checkout->is_registration_required() ) : ?>

<p class="form-row form-row-wide create-account">
				<input class="woocommerce-form__input woocommerce-form__input-checkbox input-checkbox"
					id="createaccount" <?php checked( ( true === $checkout->get_value( 'createaccount' ) || ( true === apply_filters( 'woocommerce_create_account_default_checked', false ) ) ), true ); ?>
					type="checkbox" name="createaccount" value="1"/>
				<label for="createaccount" class="checkbox"><?php esc_html_e( 'Create an account?', 'motors' ); ?></label>
			</p>

<?php endif; ?>

<?php do_action( 'woocommerce_before_checkout_registration_form', $checkout ); ?>

<?php if ( $checkout->get_checkout_fields( 'account' ) ) : ?>

<?php
				foreach ( $checkout->get_checkout_fields( 'account' ) as $key => $field ) :
					if ( apply_filters( 'stm_is_auto_parts', false ) ) {
						$field['placeholder'] = $field['label'];
					}
					?>
					<?php woocommerce_form_field( $key, $field, $checkout->get_value( $key ) ); ?>
				<?php endforeach; ?>
				<div class="clear"></div>
			</div>

<?php endif; ?>

<?php do_action( 'woocommerce_after_checkout_registration_form', $checkout ); ?>

<?php endif; ?>
</div>

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