Add first name, last name and confirm password fields into WooCommerce registration form

add_action( 'woocommerce_register_form_start', 'prefix_add_name_woo_account_registration' );

function prefix_add_name_woo_account_registration() {
    ?>

    <p class="form-row form-row-first">
    <label for="reg_billing_first_name"><?php _e( 'First name', 'woocommerce' ); ?> <span class="required">*</span></label>
    <input type="text" class="input-text" name="billing_first_name" id="reg_billing_first_name" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) esc_attr_e( $_POST['billing_first_name'] ); ?>" />
    </p>

    <p class="form-row form-row-last">
    <label for="reg_billing_last_name"><?php _e( 'Last name', 'woocommerce' ); ?> <span class="required">*</span></label>
    <input type="text" class="input-text" name="billing_last_name" id="reg_billing_last_name" value="<?php if ( ! empty( $_POST['billing_last_name'] ) ) esc_attr_e( $_POST['billing_last_name'] ); ?>" />
    </p>

    <div class="clear"></div>

    <?php
}

///////////////////////////////
// 2. VALIDATE FIELDS

add_filter( 'woocommerce_registration_errors', 'prefix_validate_name_fields', 10, 3 );

function prefix_validate_name_fields( $errors, $username, $email ) {
    if ( isset( $_POST['billing_first_name'] ) && empty( $_POST['billing_first_name'] ) ) {
        $errors->add( 'billing_first_name_error', __( '<strong>Error</strong>: First name is required!', 'woocommerce' ) );
    }
    if ( isset( $_POST['billing_last_name'] ) && empty( $_POST['billing_last_name'] ) ) {
        $errors->add( 'billing_last_name_error', __( '<strong>Error</strong>: Last name is required!.', 'woocommerce' ) );
    }
    return $errors;
}

///////////////////////////////
// 3. SAVE FIELDS

add_action( 'woocommerce_created_customer', 'prefix_save_name_fields' );

function prefix_save_name_fields( $customer_id ) {
    if ( isset( $_POST['billing_first_name'] ) ) {
        update_user_meta( $customer_id, 'billing_first_name', sanitize_text_field( $_POST['billing_first_name'] ) );
    }
    if ( isset( $_POST['billing_last_name'] ) ) {
        update_user_meta( $customer_id, 'billing_last_name', sanitize_text_field( $_POST['billing_last_name'] ) );
    }

}
// Add the code below to your theme's functions.php file to add a confirm password field on the register form under My Accounts.
add_filter('woocommerce_registration_errors', 'registration_errors_validation', 10,3);
function registration_errors_validation($reg_errors, $sanitized_user_login, $user_email) {
	global $woocommerce;
	extract( $_POST );
	if ( strcmp( $password, $password2 ) !== 0 ) {
		return new WP_Error( 'registration-error', __( 'Passwords do not match.', 'woocommerce' ) );
	}
	return $reg_errors;
}
add_action( 'woocommerce_register_form', 'prefix_register_form_password_repeat',5 );
function prefix_register_form_password_repeat() {
	?>
	<p class="form-row form-row-wide">
		<label for="reg_password2"><?php _e( 'Confirm Password', 'woocommerce' ); ?> <span class="required">*</span></label>
		<input type="password" class="input-text" name="password2" id="reg_password2" value="<?php if ( ! empty( $_POST['password2'] ) ) echo esc_attr( $_POST['password2'] ); ?>" />
	</p>
	<?php
}