{
  "type": "object",
  "properties": {
    "supplier_pib": {
      "type": "string",
      "description": "Your (seller) PIB / tax number (poreski identifikacioni broj), exactly 9 digits. Required — SEF validates it against your API-key account."
    },
    "supplier_name": {
      "type": "string",
      "description": "Your (seller) legal name (BT-27). Required for a valid invoice."
    },
    "supplier_registration_number": {
      "type": "string",
      "description": "Your (seller) company registration number (maticni broj), 8 digits (BT-30). Recommended."
    },
    "supplier_address": {
      "type": "string",
      "description": "Your (seller) street address (BT-35). Recommended."
    },
    "supplier_city": {
      "type": "string",
      "description": "Your (seller) city (BT-37). Default Beograd."
    },
    "customer_name": {
      "type": "string",
      "description": "Buyer legal name (naziv) as registered."
    },
    "customer_pib": {
      "type": "string",
      "description": "Buyer PIB / tax number, exactly 9 digits."
    },
    "customer_registration_number": {
      "type": "string",
      "description": "Buyer company registration number (maticni broj), 8 digits (BT-47). Recommended."
    },
    "customer_address": {
      "type": "string",
      "description": "Buyer street address (BT-50 address line 1)."
    },
    "customer_city": {
      "type": "string",
      "description": "Buyer city (BT-52). Default Beograd."
    },
    "customer_country": {
      "type": "string",
      "description": "Buyer country code (BT-55). Default RS."
    },
    "invoice_number": {
      "type": "string",
      "description": "Your invoice number (BT-1). Auto-generated if omitted."
    },
    "issue_date": {
      "type": "string",
      "description": "Invoice issue date (BT-2), YYYY-MM-DD. Default: today (UTC)."
    },
    "due_date": {
      "type": "string",
      "description": "Optional payment due date (BT-9), YYYY-MM-DD."
    },
    "currency": {
      "type": "string",
      "description": "Document currency (BT-5). Default RSD."
    },
    "send_to_cir": {
      "type": "boolean",
      "description": "Send to the Central Invoice Register (CRF). Set true when the buyer is a budget / public-sector user; default false for private B2B."
    },
    "lines": {
      "type": "array",
      "minItems": 1,
      "description": "Invoice lines. Each: name, unit_price (net, VAT-exclusive, RSD), vat_rate (20|10|0), optional quantity (default 1) and unit_code (UN/ECE Rec 20, default C62 = piece).",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "Item name/description (BT-153)."
          },
          "unit_price": {
            "type": "number",
            "description": "Net unit price in RSD, VAT-exclusive (BT-146)."
          },
          "vat_rate": {
            "type": "number",
            "description": "VAT rate percent: 20 standard, 10 reduced, 0 zero-rated (BT-152)."
          },
          "quantity": {
            "type": "number",
            "description": "Quantity (BT-129). Default 1."
          },
          "unit_code": {
            "type": "string",
            "description": "Unit of measure UN/ECE Rec 20 code (BT-130). Default C62 (piece)."
          }
        },
        "required": [
          "name",
          "unit_price",
          "vat_rate"
        ]
      }
    }
  },
  "required": [
    "supplier_pib",
    "supplier_name",
    "customer_name",
    "customer_pib",
    "customer_address",
    "lines"
  ]
}

{
  "type": "object",
  "properties": {
    "sales_invoice_id": {
      "type": "string",
      "description": "The sales_invoice_id returned by create_invoice."
    }
  },
  "required": [
    "sales_invoice_id"
  ]
}

{
  "type": "object",
  "properties": {
    "sales_invoice_id": {
      "type": "string",
      "description": "The sales_invoice_id returned by create_invoice."
    },
    "cancel_comment": {
      "type": "string",
      "description": "Reason for cancellation (razlog otkazivanja). Required by SEF."
    }
  },
  "required": [
    "sales_invoice_id",
    "cancel_comment"
  ]
}