extend type Mutation {
  updateFullName(input: UpdateFullNameInput!): UpdateFullNamePayload
    @authentication(required: PRESENT) @sessionOnly
  updateLocale(input: UpdateLocaleInput!): UpdateLocalePayload
    @authentication(required: PRESENT) @sessionOnly
  signOut: SignOutPayload! @authentication(required: PRESENT) @sessionOnly
}

input UpdateFullNameInput {
  fullName: String!
}

type UpdateFullNamePayload {
  success: Boolean!
}

input UpdateLocaleInput {
  # Short URL locale tag (en, fr, de, …).
  locale: String!
}

type UpdateLocalePayload {
  identity: Identity!
}

type SignOutPayload {
  success: Boolean!
}