Smaato is not available for Appodeal SDK since v2.10.3.
You need the following information to link your account: Client ID, Client Secret, Publisher ID and Adspace ID.
Client ID and Client Secret: In your Smaato dashboard click on the arrow next to your email and in the appearing menu choose OAuth API Credentials. You’ll be able to access your Client ID and Client Secret information.
Publisher ID: In the same menu that is located next to your email in Dashboard, choose My Account. Your Publisher ID is in Company Information.
Adspace ID: Go to Inventory and click on an app from Apps list. On the next page, there is a list of Adspace IDs. You can also access an Adspace ID when you select an Adspace unit from the list.