Google billing integration with xamarin android app and publish to play store

I developed a project in xamarin android apps. I would like to integrate google billing and publish to play store. You have to finish two tasks.

1) Need to add code in my apps for billing.

2) I have google developer console. So, you need to add and publish. For billing purpose I need like

My requriements :

For example

20 user <= per month $5

50 user <= per month $10

100 user <= per month $15

300 user <= per month $20

500 user <= per month $25

1000 user <= per month $50

Like this .

It also can go six month, yearly basis

Android C# Programmering Mobile App Development Xamarin

Prosjekt-ID: #16549757

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