Google play app card


I am a little apprehensive about posting here as it seems that most of the questions on this subject are going unanswered, but here goes. I have an android app available on google play. In the description I have included the following;

<meta name="twitter:card" content="app">
<meta name="twitter:description" content="Hip Hop music, news and video's.">
<meta name="twitter:app:name:googleplay" content="This is Hip Hop"/>
<meta name="twitter:app:id:googleplay" content="com.mad.hnhh"/>
<meta name="twitter:app:url:googleplay" content=""/>

I am now trying to validate this card with the card validator but am having trouble doing so as the twitter:app:id:iphone field is required, but I don’t have an ios version yet. The documentation does not state that I need both an android and an ios app to use an app card, so where am I going wrong?