curl --request POST \
  --url https://api.hubapi.com/communication-preferences/v3/subscribe \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "emailAddress": "<string>",
  "subscriptionId": "<string>",
  "legalBasis": "CONSENT_WITH_NOTICE",
  "legalBasisExplanation": "<string>"
}
'

{
  "description": "<string>",
  "id": "<string>",
  "name": "<string>",
  "sourceOfStatus": "BRAND_WIDE_STATUS",
  "status": "NOT_SUBSCRIBED",
  "brandId": 123,
  "legalBasis": "CONSENT_WITH_NOTICE",
  "legalBasisExplanation": "<string>",
  "preferenceGroupName": "<string>"
}