curl --request POST \
  --url https://api.hubapi.com/media-bridge/2026-03/{appId}/schemas/{objectType}/associations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "fromObjectTypeId": "<string>",
  "toObjectTypeId": "<string>",
  "name": "<string>"
}
'

{
  "fromObjectTypeId": "<string>",
  "id": "<string>",
  "toObjectTypeId": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "name": "<string>",
  "updatedAt": "2023-11-07T05:31:56Z"
}