Добавить подпись в PDF онлайн

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/pdf-add-signature-online' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"pdfFile.ext","contentType":"application/octet-stream","size":12345}'
curl -X POST 'https://api.elysiatools.com/api/upload/presign/pdf-add-signature-online' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"signatureImage.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/ru/api/tools/pdf-add-signature-online' \
  -F 'pdfFile=/public/samples/pdf/sample.pdf' \
  -F 'signatureType=text' \
  -F 'signatureImage=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'signatureText=Approved' \
  -F 'reason=Review complete' \
  -F 'location=' \
  -F 'includeDate=true' \
  -F 'pageTarget=last' \
  -F 'pageNumber=1' \
  -F 'position=bottom-right' \
  -F 'customX=36' \
  -F 'customY=36' \
  -F 'boxWidth=180' \
  -F 'boxHeight=72' \
  -F 'signatureColor=#1f2937'