Generador XLSX de Facturas/Cotizaciones

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/xlsx-invoice-generator' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"logoFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/es/api/tools/xlsx-invoice-generator' \
  -F 'documentType=invoice' \
  -F 'title=Tax Invoice' \
  -F 'companyInfoJson={
  "name": "Elysia Labs Ltd.",
  "address": "88 Innovation Road, Shanghai",
  "taxId": "CN-91440000-2026",
  "phone": "+86-21-8888-6666",
  "email": "[email protected]"
}' \
  -F 'customerInfoJson={
  "name": "Nova Commerce",
  "address": "120 Market Street, Shenzhen",
  "email": "[email protected]"
}' \
  -F 'lineItemsJson=[
  {
    "description": "Implementation Service",
    "quantity": 3,
    "unitPrice": 1200,
    "taxRate": 13
  },
  {
    "description": "Support Package",
    "quantity": 2,
    "unitPrice": 600
  }
]' \
  -F 'defaultTaxRate=13' \
  -F 'invoiceNumber=INV-2026-031' \
  -F 'issueDate=2026-03-06' \
  -F 'dueDate=2026-03-20' \
  -F 'currencySymbol=$' \
  -F 'logoFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'notes=Thank you for your business.'