Authorization
Authorization takes place at every request: you need to pass the OAuth token that's generated for the Yandex account for each method in the HTTP Authorization header.
GET api/v1 HTTP/1.1
Host: adfox.yandex.ru
Authorization: OAuth 05dd3dd84ff948fdae2bc4fb91f13e22bb1f289ceef0037
If the method was called without a token or an invalid token was passed in the request, the server returns the 401 Unauthorized HTTP-status.
Receiving a token
To receive a token:
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Go to the Create app page. 
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Fill out the fields: - 
Service name; 
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Service icon — optional; 
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Platforms — add one or several platforms; 
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Redirect URL — specify https://oauth.yandex.ru/verification_code;
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Data access — specify adfox:api;
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Email address — optional. 
 
- 
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Click Create app and copy its ClientID (  ). ).
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Add copied ClientID to a link such as https://oauth.yandex.com/authorize?response_type=token&client_id=<идентификатор приложения>. 
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Go to the link and on the page that opens copy your authorization token.