Additional Params in PubMatic

[mohsink4u]

Type of issue

Allowing Publishers to send key value pairs into PubMatic

Description

We would like to explore additional params from PubMatic. We want to pass categories into PubMatic which can then be used for targetting inside PubMatic. PubMatic has a param to achieve this:
var kaddctr="key1=val1,val2val3|key2=val12";

Steps to reproduce

Structure of PubMatic tag is like this:
`<script type="text/javascript">
// Specify multiple slot names over here
var pm_optimize_adslots = ['site2_section2@300x250','site3_section3@300x250'];
// PubMatic platform specific publisher identifier
var pm_pub_id = 7777;
// pm_custom is an optional parameter. Pass the key-values applicable for the impression in it to
the ad server. anything inside "" will need to be encoded. key1 has multiple params separated by commas(OR) and pipes(AND)
var kaddctr="key1=val1,val,val3|key2=val12";
var pm_async_callback_fn= 'pm_async_callback'; // Optional callback function name
</script>

<script type="text/javascript" src="http://ads.pubmatic.com/AdServer/js/gshowad.js"> </script>

`

Expected results

PubMatic will need to see this param:
dctr:key1=val,val2,val3|key2=val12
//kaddctr converts into dctr

Actual results

Tag needs to fire like this:
`<script type="text/javascript">
var pm_optimize_adslots = ['site2_section2@300x250','site3_section3@300x250'];
var pm_pub_id = 77777;
var kaddctr="key1%3Dval%2Cval2%2Cval3%7Ckey2%3Dval12";
// key values"key1=val,val2,val3|key2=val12" will need to be encoded before they are sent to PubMatic
//var pm_async_callback_fn= 'pm_async_callback'; // Optional callback function name
</script>

<script type="text/javascript" src="http://ads.pubmatic.com/AdServer/js/gshowad.js"> </script>`

Platform details

Other information

[boolean4]

@mkendall07 @prebid

[mkendall07]

We accpet PRs. Otherwise will add to the backlog to do at some point.