Create an invoice

1. Identify the customer

curl https://api.cedius.app/v1/customers   -H "Authorization: Bearer $CEDIUS_API_KEY"

2. Create the invoice

curl -X POST https://api.cedius.app/v1/invoices   -H "Authorization: Bearer $CEDIUS_API_KEY"   -H "Content-Type: application/json"   -d '{
    "customer_id": "cus_4d7c21",
    "due_date": "2026-09-20",
    "tax": 11250,
    "items": [
      {
        "description": "Website maintenance",
        "quantity": 1,
        "unit_price": 150000
      }
    ]
  }'

3. Inspect the invoice

curl https://api.cedius.app/v1/invoices/inv_91ac20   -H "Authorization: Bearer $CEDIUS_API_KEY"

4. Respect invoice state

Draft and pending invoices can be updated. Paid invoices cannot be freely edited.