createActivity
No description
createActivity(
  accountId: Int!
  answers: [ActivityTypeAnswerInput!]
  closed: Boolean
  contactId: Int!
  description: String!
  endTime: String
  externalKey: String
  invitedUsers: [Int]
  location: String
  opportunityId: Int
  result: String
  scheduledDate: String!
  startTime: String
  tags: [ID!]
  typeId: Int!
  userId: Int!
): Activity