Get a subscription

curl --request GET \
  --url https://api.alguna.io/subscriptions/{id} \
  --header 'Alguna-Version: <alguna-version>' \
  --header 'Authorization: Bearer <token>'

{
  "billing": {
    "auto_issue_invoices": true,
    "auto_pay_invoices": false,
    "first_billing_date": "2026-01-01T00:00:00Z",
    "payment_terms": "net_30"
  },
  "contract": {
    "period_type": "fixed",
    "duration_months": 12,
    "end_date": "2027-01-01T00:00:00Z",
    "start_date": "2026-01-01T00:00:00Z"
  },
  "created_at": "2025-12-15T10:30:00Z",
  "currency": "USD",
  "customer_id": "cust_abc123",
  "id": "sub_abc123",
  "metadata": {},
  "name": "Acme Corp - Enterprise",
  "pending_changes": [
    {
      "status": "draft",
      "version_id": "subv_abc123",
      "description": "Q3 upgrade",
      "effective_at": "2027-01-01T00:00:00Z"
    }
  ],
  "renewal": {
    "auto_renew": true,
    "duration_months": 12,
    "period_type": "fixed"
  },
  "status": "active",
  "updated_at": "2026-04-04T10:00:05Z",
  "activated_at": "2026-01-01T00:00:00Z",
  "current_version_id": "subv_abc123",
  "discount": {
    "amount": "10",
    "duration_type": "fixed",
    "type": "percentage",
    "duration_unit": "months",
    "duration_value": 6
  },
  "maximum_spend": {
    "amount": "500.00",
    "period": "monthly"
  },
  "minimum_spend": {
    "amount": "500.00",
    "period": "monthly"
  },
  "plan_id": "pln_abc123",
  "price_escalation": {
    "enabled": true,
    "interval_months": 12,
    "type": "percentage",
    "escalate_metered_unit_rates": false,
    "percentage": "5.00"
  },
  "trial_period_days": 30
}