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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'fetch',
    initial: 'draft',
    context: {
      amountDue: 30,
      amountPaid: 0
    },
    states: {
      draft: {
        on: {SUBMIT_FOR_APPROVAL: 'pending_approval'}
      },
      pending_approval: {
        on: {
          REDRAFT: 'draft',
          APPROVE: 'approved', 
          REJECT: 'rejected'
        }
      },
      rejected: {on: {REDRAFT: 'draft'}},
      approved: {
        on: {SUBMIT: 'submitted',
             REDRAFT: 'draft'
        }
      },
      submitted: {
        on: {
          PARTIAL_PAYMENT: 'partially_paid',
          FULL_PAYMENT: 'paid',
          WRITE_OFF: 'written_off'

        }
      },
      partially_paid: {
        on: {FULL_PAYMENT: 'paid', PARTIAL_PAYMENT: 'partially_paid',
        WRITE_OFF: 'written_off'
        }
      },
      paid: {type: 'final'},
      written_off: {type: 'final'},
    }
  });