payment-gem/lib/payment/errors.rb

module Payment::Errors
  ERROR_CODES = %i[insufficient_funds retry_later].freeze

  class PaymentErrorCodesMismatchError < StandardError; end

  def self.included(base)
    raise PaymentErrorCodesMismatchError.new("'#{ERROR_CODES.difference(base::ERROR_MAP.values).join(", ")}' method(s) are not included in #{base}") if ERROR_CODES.difference(base::ERROR_MAP.values).any?
  end
end