mutation Register($identifier: String!, $password: String!, $email: String!) {
  register(input: { username: $identifier, password: $password, email: $email }) {
    jwt
    user {
      username
    }
  }
}

mutation Login($identifier: String!, $password: String!) {
  login(input: { identifier: $identifier, password: $password }) {
    jwt
  }
}