Create user https://atheros.ai/blog/input-object-type-as-an-argument-for-graphql-mutations-and-queries

inputTypes-4.graphql

mutation createUser {
  createUser(input: {
      username: "test", 
      email: "test@test.cz", 
      phone: "479332973", 
      firstName: "David", 
      lastName: "Test"
    }) {
    user {
        id
        username
        email
        phone
        firstName
        lastName
    }
  }
}