curl --request PUT \
  --url https://api.plazbot.com/api/opportunity/{opportunityId}/activities/{activityId}/toggle \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "code": 123,
  "message": "<string>",
  "data": {
    "activityId": "<string>",
    "completed": true
  }
}