Scala Hosting has an affiliate program and you can learn more about it at https://www.scalahosting.com/affiliate.html. You can activate your affiliate account from your client area -> Affiliates. You will get a custom link which you will need to send to your friends. Everyone who has signed up via your affiliate link will be added to your affiliate account. You will then earn 10% from all payments for web hosting services of that client.
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