curl --request GET \
  --url 'https://api.nsr.stateset.com/api/v1/billing/subscription' \
  --header 'X-API-Key: YOUR_API_KEY'

{
  "cancel_at_period_end": true,
  "current_period_end": "string",
  "status": "string",
  "subscription_id": "string",
  "tier": "string"
}