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machine.js

const checkMachine = Machine({
  id: 'check',
  initial: 'untaken',
  context: {
    restarts: 0
  },
  states: {
    untaken: {
      on: {
        ALLOCATE: 'allocated'
      }
    },
    allocated: {
      on: {
        LOGIN: 'collected'
      }
    },
    collected: {
      on: {
        RECEIVED: 'submitted'
      }
    },
    submitted: {
      on: {
        PROCESSING_FAILED: 'rejected',
        PROCESSING_SUCCESS: 'complete'
      }
    },
    complete: {
      type: 'final' // can we restart after completion?
    },
    rejected: {
      on: {
        RESTART: 'untaken' // TODO context.restarts++
      }
    }
  }
})