curl --request PUT \
  --url https://api.example.com/pricing/{policyId}/selection \
  --header 'Content-Type: application/json' \
  --data '
{
  "tierId": "<string>",
  "policyCustomFields": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ]
}
'

{
  "saved": true
}