curl --request POST \
  --url https://api.altostrat.io/workspaces/{workspaceId}/billing-accounts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "ACME Corp (EU)",
  "email": "billing-eu@acme.com",
  "phone": "+442071234567",
  "description": "For all European operations.",
  "currency": "eur",
  "address": {
    "country": "US",
    "line1": "123 Main Street",
    "line2": "Suite 456",
    "city": "San Francisco",
    "state": "CA",
    "postal_code": "94105"
  }
}'

{
  "id": "cus_a1b2c3d4e5f6g7h8",
  "workspace_id": "ws_a1b2c3d4e5f6g7h8",
  "name": "ACME Corp Billing",
  "email": "billing@acme.com",
  "phone": "+15551234567",
  "description": "For US-based operations",
  "currency": "usd",
  "address": {
    "country": "US",
    "line1": "123 Main Street",
    "line2": "Suite 456",
    "city": "San Francisco",
    "state": "CA",
    "postal_code": "94105"
  },
  "created_at": "2025-10-29T00:40:06.000000Z",
  "updated_at": "2025-10-29T00:40:06.000000Z"
}