The API can return data as either XML or JSON. The HTTP "Accept" header must be set in the request. This can be "application/json" or "application/xml"

Alternatively you may specify which data format to return by appending a query parameter "_format" with a value of either "json" or "xml".

Example: https://api.poken.com/rest081/account/profile?applicationId=*fill-in-yours*&applicationSecret=*fill-in-yours*&_format=json