public void Postback_WithPayload_ShouldPostPayload()
{
var api = GetApi();
string payloadData = "specificdata";
var payload = GetPayLoad(payloadData);
api.Metrics.UploadPluginData("blahblah", payload);
RequestClientMock.Verify(x => x.Post(It.IsAny<string>(), It.Is<string>(y => y.Contains(payloadData))));
}