curl --request GET \
  --url https://api.example.com/staking/validators/{validator_addr}/delegators/{delegator_addr}/period_delegations

{
  "code": 123,
  "msg": [
    {
      "delegator_address": "<string>",
      "validator_address": "<string>",
      "period_delegation_id": "<string>",
      "shares": "<string>",
      "rewards_shares": "<string>",
      "end_time": "<string>"
    }
  ],
  "error": "<string>"
}