Articles in this category Introduction Print HTTP Errors We use conventional HTTP response codes to indicate the success or failure of an API request. In general: Codes in the 2xx range indicate success. Codes in the 4xx range indicate an error that failed ... Payloads The Web API uses standard JSON to communicate data between client and server. All requests and responses have an organised standard response format Authentication API requests are authenticated via the Authorization HTTP header. The header information is constructed from the client_id and client_secret which is generated when your account is created.