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policy_id 

        # OpenSSL::Timestamp::TokenInfo.policy_id

(from ruby core)
### Implementation from TokenInfo
---
    token_info.policy_id -> string or nil

---

Returns the timestamp policy object identifier of the policy this
timestamp was created under. If status is GRANTED or GRANTED_WITH_MODS,
this is never `nil`.

### Example:
    id = token_info.policy_id
    puts id                 -> "1.2.3.4.5"

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