ENUM
# ActivationTokenError
An enumeration that describes issues with verification confirmation.
# Cases
# invalidURL
URL received in the universal link is invalid.
# invalidActivationCode
Activation code received in the universal link is empty or nil.
# invalidUserId
User identifier received in the universal link is empty or nil.
# invalidVerificationConfirmationResponse
There is an unknown issue when handling the verification/confirmation
request/response.
# apiError(activationTokenErrorResponse:)
The request for fetching the activation token failed with an error. There may be ActivationTokenErrorResponse in the error.