add-watermark-to-pdf

# add-watermark-to-pdf

## Purpose
This skill adds a text watermark to one or multiple PDFs by:
1) accepting one or multiple PDF files from the user,
2) accepting a watermark text string,
3) uploading them to the Solutions API,
4) polling the job status until it is finished,
5) returning download URL(s) for the resulting file(s).
If multiple PDFs are processed, the output may include multiple PDFs and/or a ZIP for download.

## Credentials
The API requires an API key used as a Bearer token:
- `Authorization: Bearer <API_KEY>`

How the user gets an API key:
- https://login.cross-service-solutions.com/register
- Or the user can provide an API key directly.

**Rule:** never echo or log the API key.

## API endpoints
Base URL:
- `https://api.xss-cross-service-solutions.com/solutions/solutions`

Create watermark job:
- `POST /api/61`
- `multipart/form-data` parameters:
  - `files` — required — multiple PDF files (multiple_files)
  - `text` — required — string (watermark text)

Get result by ID:
- `GET /api/<ID>`

When done, the response contains:
- `output.files[]` with `{ name, path }` where `path` is a downloadable URL (PDFs and/or ZIP).

## Inputs
### Required
- One or more PDF files (binary)
- Watermark text (`text`, string)
- API key (string)

### Optional
- None

## Output
Return a structured result:
- `job_id` (number)
- `status` (string)
- `outputs` (array) containing `{ name, path }` for each output file
- Convenience fields:
  - `download_url` (string) if exactly one output exists
  - `download_urls` (array of strings) for all outputs
- `input_files` (array of strings)
- `watermark_text` (string) — returned only if safe; do not return if user considers it sensitive

Example output:
```json
{
  "job_id": 6101,
  "status": "done",
  "outputs": [
    { "name": "watermarked.pdf", "path": "https://.../watermarked.pdf" }
  ],
  "download_url": "https://.../watermarked.pdf",
  "download_urls": ["https:/...

---

## `README.md`

```md
# add-watermark-to-pdf (OpenClaw Skill)

Add a text watermark to one or multiple PDFs using the Solutions API and return download URL(s).
If multiple PDFs are processed, the API may also provide a ZIP file.

## What you need
- 1+ PDF file(s)
- Watermark text (string) used as `text`
- A Solutions API key (Bearer token)
  - Register / get key: https://login.cross-service-solutions.com/register

## How it works
1) Upload PDFs + watermark text to:
   `POST https://api.xss-cross-service-solutions.com/solutions/solutions/api/61`
2) Poll:
   `GET  https://api.xss-cross-service-solutions.com/solutions/solutions/api/<job_id>`
3) Return `output.files[].path` as download URL(s)

## Script (CLI)
```bash
python scripts/add_watermark_to_pdf.py \
  --pdf "/path/to/a.pdf" \
  --pdf "/path/to/b.pdf" \
  --text "CONFIDENTIAL" \
  --api-key "$SOLUTIONS_API_KEY"