curl https://api.tradly.app/products/v1/listings/{{listing_id}}/negotiations/{{negotiation_id}} \
  -H "Authorization: Bearer YOUR_PUBLISHABLE_OR_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -X PATCH \
  -d '{
  "negotiation": {
    "status": 2
  }
}'

{
  "status": true,
  "data": {
    "negotiation": {
      "id": 1,
      "status": "accepted"
    }
  }
}