curl --request GET \
  --url https://api-v2.missioninbox.com/billing/subscription_status/ \
  --header 'Authorization: Basic <encoded-value>'

{
  "has_subscription": true,
  "subscription_id": "<string>",
  "status": "<string>",
  "current_period_start": 123,
  "current_period_end": 123,
  "cancel_at_period_end": true,
  "billing_interval": "<string>",
  "plan_name": "<string>",
  "amount": 123,
  "user_type": "<string>",
  "cancelled_at": "<string>",
  "is_non_renewing": true,
  "can_reactivate": true,
  "subscription_display_status": "<string>"
}