To use the API, you must have the network ID of the network you work with and an API key for the advertiser API. You can get this information from the HasOffers platform in Support > API.
Note: If the "API" link doesn't appear, then your network has disabled access to the advertiser API.
On the Advertiser API page, find the API Key header and click the "Request API Key" link to request an API key from your network. Once the request is approved by your network, your API key takes the place of the "request" link. Now you're ready to make a call to the Advertiser API.
And keep your API key secure—it's essentially the password to your account from the API's perspective.