procedure TForm2.Button2Click(Sender: TObject);
var
jsRequest: TJSONObject;
u8BearerToken:UTF8String;
begin
RESTClient1.BaseURL := 'https://xxxxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/v1/';
RESTRequest1.Resource := 'monitoring/logregister';
RESTRequest1.Method := TRESTRequestMethod.rmPOST;
jsRequest := TJSONObject.Create();
jsRequest.AddPair('UserName', 'un');
jsRequest.AddPair('Password', 'pw');
RESTRequest1.AddBody(jsRequest);
u8BearerToken:='Bearer XXXXXXXX';
RESTRequest1.Params.AddHeader('Authentication', u8BearerToken);
RESTRequest1.Execute;
jsRequest.Free();
end;