curl --request PUT \
  --url https://{tenant}/api/apis/oas/{apiId}/categories \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "categories": [
    "dev",
    "testers",
    "messages"
  ]
}
'

{
  "Message": "API categories updated.",
  "Meta": null,
  "Status": "OK"
}