Installation problem: variable missing: BILLING_KEY

[Andrea2985]

I'm try to install the plugin with phonegap 3.6.0, i've cloned the project in my repository but when I run the installation it's say me: variable missing: BILLING_KEY.
I've got the Base64 key from google play.
Can you help me or write me a step by step guide, maybe I mistake something

Thanks

[sydneyhenrard]

Documentation: phonegap local plugin add /path/to/your/cloned/plugin/AndroidInAppBilling --variable BILLING_KEY="MIIBIjANBgk...AQAB"

[satmaramani]

cordova plugin add /path/to/your/cloned/plugin/AndroidInAppBilling --variable BILLING_KEY=""

[stylohunk]

I added this .

I am getting this error.

Error: Invalid package.json

In folder there is no package.json file

how to solve