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Edit File: class-wc-payment-gateway-cc.php

<?php
/**
 * Class WC_Payment_Gateway_CC file.
 *
 * @package WooCommerce\Gateways
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Credit Card Payment Gateway
 *
 * @since       2.6.0
 * @package     WooCommerce\Classes
 */
class WC_Payment_Gateway_CC extends WC_Payment_Gateway {

/**
	 * Builds our payment fields area - including tokenization fields for logged
	 * in users, and the actual payment fields.
	 *
	 * @since 2.6.0
	 */
	public function payment_fields() {
		if ( $this->supports( 'tokenization' ) && is_checkout() ) {
			$this->tokenization_script();
			$this->saved_payment_methods();
			$this->form();
			$this->save_payment_method_checkbox();
		} else {
			$this->form();
		}
	}

/**
	 * Output field name HTML
	 *
	 * Gateways which support tokenization do not require names - we don't want the data to post to the server.
	 *
	 * @since  2.6.0
	 * @param  string $name Field name.
	 * @return string
	 */
	public function field_name( $name ) {
		return $this->supports( 'tokenization' ) ? '' : ' name="' . esc_attr( $this->id . '-' . $name ) . '" ';
	}

/**
	 * Outputs fields for entering credit card information.
	 *
	 * @since 2.6.0
	 */
	public function form() {
		wp_enqueue_script( 'wc-credit-card-form' );

$fields = array();

$cvc_field = '<p class="form-row form-row-last">
			<label for="' . esc_attr( $this->id ) . '-card-cvc">' . esc_html__( 'Card code', 'woocommerce' ) . '&nbsp;<span class="required">*</span></label>
			<input id="' . esc_attr( $this->id ) . '-card-cvc" class="input-text wc-credit-card-form-card-cvc" inputmode="numeric" autocomplete="off" autocorrect="no" autocapitalize="no" spellcheck="no" type="tel" maxlength="4" placeholder="' . esc_attr__( 'CVC', 'woocommerce' ) . '" ' . $this->field_name( 'card-cvc' ) . ' style="width:100px" />
		</p>';

$default_fields = array(
			'card-number-field' => '<p class="form-row form-row-wide">
				<label for="' . esc_attr( $this->id ) . '-card-number">' . esc_html__( 'Card number', 'woocommerce' ) . '&nbsp;<span class="required">*</span></label>
				<input id="' . esc_attr( $this->id ) . '-card-number" class="input-text wc-credit-card-form-card-number" inputmode="numeric" autocomplete="cc-number" autocorrect="no" autocapitalize="no" spellcheck="no" type="tel" placeholder="&bull;&bull;&bull;&bull; &bull;&bull;&bull;&bull; &bull;&bull;&bull;&bull; &bull;&bull;&bull;&bull;" ' . $this->field_name( 'card-number' ) . ' />
			</p>',
			'card-expiry-field' => '<p class="form-row form-row-first">
				<label for="' . esc_attr( $this->id ) . '-card-expiry">' . esc_html__( 'Expiry (MM/YY)', 'woocommerce' ) . '&nbsp;<span class="required">*</span></label>
				<input id="' . esc_attr( $this->id ) . '-card-expiry" class="input-text wc-credit-card-form-card-expiry" inputmode="numeric" autocomplete="cc-exp" autocorrect="no" autocapitalize="no" spellcheck="no" type="tel" placeholder="' . esc_attr__( 'MM / YY', 'woocommerce' ) . '" ' . $this->field_name( 'card-expiry' ) . ' />
			</p>',
		);

if ( ! $this->supports( 'credit_card_form_cvc_on_saved_method' ) ) {
			$default_fields['card-cvc-field'] = $cvc_field;
		}

$fields = wp_parse_args( $fields, apply_filters( 'woocommerce_credit_card_form_fields', $default_fields, $this->id ) );
		?>

<fieldset id="wc-<?php echo esc_attr( $this->id ); ?>-cc-form" class='wc-credit-card-form wc-payment-form'>
			<?php do_action( 'woocommerce_credit_card_form_start', $this->id ); ?>
			<?php
			foreach ( $fields as $field ) {
				echo $field; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
			}
			?>
			<?php do_action( 'woocommerce_credit_card_form_end', $this->id ); ?>
			<div class="clear"></div>
		</fieldset>
		<?php

if ( $this->supports( 'credit_card_form_cvc_on_saved_method' ) ) {
			echo '<fieldset>' . $cvc_field . '</fieldset>'; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
		}
	}
}

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