curl --request GET \
  --url https://cloud-api.phala.com/api/v1/kms/{kms_id}

{
  "id": "<string>",
  "url": "<string>",
  "version": "<string>",
  "slug": "<string>",
  "chain_id": 123,
  "kms_contract_address": "<string>",
  "gateway_app_id": "<string>"
}