All API POST and PUT requests expect a top-level object with a single element in it named data. Successful responses will mirror this format. The data element should itself be an object, containing the parameters for the request. In the case of creating a new tender, these are the fields we want to set on the tender itself.
If the request was successful, we will get a response code of 201 indicating the object was created. That response will have a data field at its top level, which will contain complete information on the new tender, including its ID.
If something went wrong during the request, we'll get a different status code and the JSON returned will have an errors field at the top level containing a list of problems. We look at the first one and print out its message.