curl --request GET \
  --url https://api.gcore.com/cloud/v1/dbaas/postgres/configuration/{project_id}/{region_id} \
  --header 'Authorization: <api-key>'

{
  "flavors": [
    {
      "cpu": 1,
      "memory_gib": 1,
      "pg_conf": "\nlisten_addresses = 'localhost'\nport = 5432\nmax_connections = 100\nshared_buffers = 128MB\nlogging_collector = on"
    }
  ],
  "storage_classes": [
    {
      "name": "ssd-hiiops"
    }
  ],
  "versions": [
    "14",
    "15"
  ]
}