This should help:
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thank you 
Mark as the solution if it works.
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how to use the call block?
Just instead of the block put blocks that are neccassery to do that. For example call removeAds: set ad.visible to false.
you need to create a procedure when you create a procedure that under procedure it will show the “call block” with your procedure name
when you name your procedure you have to place blocks for what you want that particular procedure to do in your case you can place set AdMob visible to false under procedure and it will execute when you call it.
If it works please mark my answer as the solution. It is for the people.
it gives me this error
Attempt to invoke virtual method ‘boolean com.anjlab.android.iab.v3.BillingProcessor.purchase(android.app.Activity, java.lang.String)’ on a null object reference
You didn’t insert a MerchantID and the required stuff. Take a look at @Taifun’s tutorial on how to set it up.
ok, I marked your comment as solution. But how do I find the subscription id, product id and license key? I got my merchant ID.
Subscription/Product ID:
1.Go to the settings tab.
2. Go to Pricing templates
3.Select your Product or create a new one.
4.There it is!
License Key:
1.Select your app
2.Go to Development tools => Services & APIs
3.That loooooooooong text is your license key for that app!
did it work?
i’m still waiting for google to to rollout the app update 
Lol. I know, it takes some time. Will you send me the link when the app is published?
sure I will
Is the app live yet?
nope… still not
Takin’ a lot of time…my app is usually published within 4 hours.
i know. I wrote to them and they said to wait 48hours more…
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