In order to use the Betting API, you need to have an Application Key. The Application Key identifies your API client.
You must pass the Application Key with every HTTP request. You do this by setting the HTTP header with the value of the key assigned by Betfair.:
You can create an Application Key for your Betfair account using the createDeveloperAppKeys operation. Please see the API reference guide for details of this operation.
X-Application: "APP_KEY_ASSIGNED"
Please note: the X-Application header is not required when using the createDeveloperAppKeys or the getDeveloperAppKeys service.