I am using the wordpress shopp plugin to sell products on my site. On my template file, I am using a shopp short code to display a particular category. It looks like this:

```
<?php shopp('catalog','category','load=true&id=16'); ?>

```

I would like the number 16 to be changeable, so I have stored the correct dynamic number in a variable as follows:

```
<?php $shopid = get_field('store_id'); ?>

```

The Variable `$shopid` is the correct number that should replace the '`16`' above. The question is, how do I place a variable in the shopp shortcode? I tried as follows without luck:

```
<?php shopp('catalog','category','load=true&id=$shopid'); ?>

```

Any ideas how to pull this off?