curl --request PUT \
  --url https://api.withorb.com/v1/dimensional_price_groups/{dimensional_price_group_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "metadata": {},
  "external_dimensional_price_group_id": "<string>"
}'

{
  "metadata": {},
  "id": "<string>",
  "name": "<string>",
  "external_dimensional_price_group_id": "my_dimensional_price_group_id",
  "dimensions": [
    "region",
    "instance_type"
  ],
  "billable_metric_id": "<string>"
}