I don't get an early adapter badge even though I bought a license.
The rewarding system is kinda picky...
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ewards
Every one who purchases an early adopter license also gets a medal on their avatar, and an Early adopter badge for their profile. If you have purchased an early adopter license and still have not received your badge, send an email to licensehelpiys@scirra.com with your transaction ID and username and we can issue your badges.
Exctract from tutorial "How licenses work".
And also this post should gives you more informations.
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Thanks Kyatric, funny thing is that I read this tutorial but did not care enough about the badge, but one gets greedy over time...