There are several reports that FEC filings confirm Roger Stone was paid by the Trump campaign until around August 2015, almost a year before Trump won the nomination.
Roger Stone and Paul Manafort lobbied in behalf of Trump’s casino businesses since the ‘90s.
Trump announced his candidacy in July 2015, so then Stone worked for the campaign for the first month of the campaign only? Of course, we all know that Putin could tell Trump was going to win and hence used that first month to buy him off through Roger Stone, I suppose.