Since the agreement in the negotiations. The result obtained is satisfying both sides, thus making both sides conduct business smoothly and progressively in the course of business with both parties.
Since the agreement in the negotiations. The result has been the satisfaction of both sides, so both the business smoothly. And advances in business with both parties.
Because what is OK in the negotiations. The receiver is to satisfy both parties, so both sides business smoothly. And making progress in business on both sides.