add custom field “tax id code”

I added the custom field “CodiceFiscal” in the donation form by modifying the functions.php file with the following code

function wpsites_no_posts_text() {
    echo '<span class="sorry-no-posts"></span>'; 
    echo '<p class="no-posts"></p>'; 
}

add_action( 'give_fields_donation_form_register_login_fields', function( $group ) {
    $group->append(
        give_field( 'text', 'CodiceFiscale' )
            ->showInReceipt()
            ->minLength(16)
            ->label( __( 'Codice Fiscale' ))
            ->maxLength(16)
            ->placeholder('Codice Fiscale') 
			->storeAsDonorMeta()
            ->required() // Could instead be marked as readOnly() (optional)
            ->helpText( __( 'Inserisci il tuo Codice Fiscale' ) ) //how this is displayed is up to the template, but if the template has help text displayed, this is how to set it.
    );
});

However, I am unable (or do not understand how) to show the contents of the added field (Fiscal Code) in the donation details in the back office