hey Andrew,
it seems like this JSON code I copied from this blog post( Help Lucas is opgegeten! ), it seems work fine.
<script type="text/javascript">var bol_pml={"id":"bol_1439498177780","secure":false,"baseUrl":"partnerprogramma.bol.com","urlPrefix":"//aai.bol.com/openapi/services/aai/","productId":"productid=9200000018304807&","site_id":"23736","target":true,"rating":true,"price":true,"link_name":"Cristel","link_subid":"","image_size":true,"image_position":"left","width":"250","cols":"1","background_color":"#FFFFFF","text_color":"#F39C12","link_color":"#2980B9","border_color":"#D2D2D2","letter_type":"verdana","letter_size":"11"};</script>
<script src="//partnerprogramma.bol.com/partner/static/js/aai/clientProductlink.js" id="bol_1439498177780" type="text/javascript"></script>
This screenshot is show the correct code ->
http://screencast.com/t/pKtJ4uFuLF6u
You can take a look of this test post ->
https://www.opgroeigids.nl/blog/test-is-test-json-code-post-please-ignore
I using the HTML block, check my screenshot below.