message: Convert TransferType to enum
diff: -export const TransferStatus = {
  - initial: 'initial',
  - invalid: 'invalid',
  - incomplete: 'incomplete',
  - declined: 'declined',
  - cancelled: 'cancelled',
  - succeeded: 'succeeded',
  +export enum TransferStatus {
  + initial = 'initial',
  + invalid = 'invalid',
  + incomplete = 'incomplete',
  + declined = 'declined',
  + cancelled = 'cancelled',
  + succeeded = 'succeeded',
  }
  