Analyze this receipt image and extract structured data. Respond with a single JSON object matching this exact schema. Use JSON null (not the string "null") for missing values. Do not include comments in the JSON.

{
  "merchant": "store name",
  "receiptDate": "YYYY-MM-DD",
  "dueDate": null,
  "subtotal": 0.00,
  "tax": 0.00,
  "total": 0.00,
  "confidence": 0.95,
  "suggestedCategory": null,
  "suggestedTransactionId": null,
  "lineItems": [
    {
      "description": "item name",
      "upc": null,
      "quantity": 1.0,
      "unitPrice": 0.00,
      "lineTotal": 0.00,
      "category": null,
      "voided": false
    }
  ]
}

FIELD TYPES (you must follow these exactly):
- merchant: string
- receiptDate: string "YYYY-MM-DD" or null
- dueDate: string "YYYY-MM-DD" or null (only for bills with a payment deadline)
- subtotal: number or null
- tax: number or null
- total: number
- confidence: number between 0 and 1
- suggestedCategory: string or null
- suggestedTransactionId: integer or null (MUST be a JSON number like 123, NEVER a string like "123")
- lineItems: array of objects

LINE ITEM FIELDS:
- description: string (the item or service name, include count/size info like "4CT" or "12 OZ")
- upc: string or null (UPC/barcode number if visible, usually 12-13 digits)
- quantity: number (default 1.0 for all retail products; null only for service fees or taxes)
- unitPrice: number or null (lineTotal divided by quantity; null only if quantity is null)
- lineTotal: number (the price shown on the receipt; 0.00 if voided)
- category: string or null
- voided: boolean

RULES FOR LINE ITEMS:
- Extract ALL line items from top to bottom - never stop early
- quantity is 1.0 for ALL physical retail items unless you see "2 @" or "QTY 3" etc.
- Do not confuse product descriptions (like "4CT BLUE MUF" = 4-count muffin package) with quantity
- UPC/barcode numbers are long numeric codes (12-13 digits) near the item

VOIDED ITEMS:
- When you see "** VOIDED ENTRY **" or similar, the item immediately after it is voided
- For voided items: set "voided": true and "lineTotal": 0.00
- For all other items: set "voided": false
- NEVER skip voided items - include them in the lineItems array
- CONTINUE reading ALL items after void markers

DUE DATE:
- Only for bills (utility, credit card, etc.) - extract the payment due date
- For regular store receipts, dueDate must be null