curl --request GET \
  --url {schemes}://api.upsun.com/organizations/{organization_id}/subscriptions/can-create \
  --header 'Authorization: Bearer <token>'

{
  "can_create": true,
  "message": "<string>",
  "required_action": {
    "action": "<string>",
    "type": "<string>",
    "credentials": {},
    "reference": "<string>"
  }
}