The Mobile Offer REST API must be activated by Fyber.
If you have not done it yet, contact your Fyber's Developer Support representative to enable it for your application:
As soon as this feature is turned on for your application, Fyber will provide you with an API key that you will need for all requests.
The API key should not be shared with a third party. It is specific to you and your application. You will be personally responsible for the use of the Fyber Mobile Offer API key.
The next page contains the necessary details of our Mobile Offer Wall REST API, so you can begin to implementing the REST API.