Get private key

curl --request POST \
  --url https://api.0xkey.io/public/v1/query/get_private_key \
  --header 'Content-Type: application/json' \
  --header 'X-Stamp: <api-key>' \
  --data '
{
  "organizationId": "<string>",
  "privateKeyId": "<string>"
}
'

{
  "privateKey": {
    "privateKeyId": "<string>",
    "publicKey": "<string>",
    "privateKeyName": "<string>",
    "curve": "CURVE_UNSPECIFIED",
    "addresses": [
      {
        "format": "ADDRESS_FORMAT_UNSPECIFIED",
        "address": "<string>"
      }
    ],
    "privateKeyTags": [
      "<string>"
    ],
    "createdAt": {
      "seconds": "<string>",
      "nanos": "<string>"
    },
    "updatedAt": {
      "seconds": "<string>",
      "nanos": "<string>"
    },
    "exported": true,
    "imported": true
  }
}