func ExampleDecode() {
  q := "NZCP: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"

  t, err := nzcpv.NewToken(q)
  if err != nil {
    fmt.Println(err)
    return
  }

  // pretty print
  s, _ := json.MarshalIndent(t, "", "  ")
  fmt.Println(string(s))

  // Output:
  // {
  //   "KeyID": "key-1",
  //   "Algorithm": -7,
  //   "Issuer": "did:web:nzcp.covid19.health.nz",
  //   "NotBefore": "2021-11-03T09:05:30+13:00",
  //   "Expires": "2031-11-03T09:05:30+13:00",
  //   "JTI": "urn:uuid:60a4f54d-4e30-4332-be33-ad78b1eafa4b",
  //   "Claims": {
  //     "Context": [
  //       "https://www.w3.org/2018/credentials/v1",
  //       "https://nzcp.covid19.health.nz/contexts/v1"
  //     ],
  //     "Version": "1.0.0",
  //     "Type": [
  //       "VerifiableCredential",
  //       "PublicCovidPass"
  //     ],
  //     "CredentialSubject": {
  //       "GivenName": "Jack",
  //       "FamilyName": "Sparrow",
  //       "DOB": "1960-04-16"
  //     }
  //   },
  //   "Signature": "0uB7HdcmPYMxZr27TxoJODepBdfsou6Da2sq2iPCMVT7qIpSn2ddZobuYysJ7FgasI9ytFiQS7M5bRD6ZtEUdw=="
  // }
}