Place it at the exact point of agreement in an edit, as the answer to the question just asked, then cut straight to the next shot or line. Keep it as the only spoken answer in that beat, and follow it with a reaction sound only if the next moment needs a visible response.
About this sound
This is a very short voice clip, lasting about half a second, built around a single spoken French word, d'accord, meaning agreement. It lands as a flat, matter-of-fact yes, with no build-up and no extra words to soften it. That brevity makes it feel dry and slightly abrupt, like an answer given before the question has fully finished.