Output Custom fields in table with Shortcode

Sory for the complete newbie question but after 2 days struggling:

I have made a custom post called cars in Worpress with a plugin that adds numerous specs for cars that are for sale. The specs are in custom fields, such as price, make, model etc.
I want to use a shortcode [showdetails] to display a table with these specs.

When i paste the table directly into a custom post single-cars.php like this it works.

<p> <label>Prijs:</label> </br>
<input type=”text” name=”prijs” value=”<?= @$custom[“prijs”][0] ?>” class=”width33″ /> </p>

How do i get this table to display with a shortcode [showdetails]

I now have

<?php
function showdetails_shortcode( $attr, $content = null ) {
return ‘<table> <tr> <th>Prijs Component</th> <th>Bedrag euros</th> </tr> <tr> <td>Prijs</td> <td></table>’;
/********This shows the start of the table, but now the cell with the custom field… *********************

<?php $key=”prijs”; echo get_post_meta($post->ID, $key, true); ?></td> </tr>

**************************************************/
</table>
}
add_shortcode(‘showdetails’, ‘showdetails_shortcode’);
?>

This works but as soon as i (think) i call the value of a custom field it all goes wrong.

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