How to get your API keys:

**1. OCR (Tesseract)**

Tesseract is a free, open-source OCR engine. You don't need an API key in the traditional sense, but you do need to install it on your server.

- **On Debian/Ubuntu:**
  `sudo apt update`
  `sudo apt install tesseract-ocr`
  `sudo apt install tesseract-ocr-heb` (for Hebrew language support)

- **On CentOS/RHEL:**
  `sudo yum install tesseract`
  (You may need to find a repository that has the Hebrew language pack)

No API key needs to be set in the environment variables for Tesseract. The application will call it from the command line.

**2. AI Service (Free Tier or Mock)**

For the MVP, we are using a free or mock AI service. There are several options for free language models. One option is to use a free tier from a provider. Another is to set up a local model if you have the hardware.

For a simple mock setup, you can have the application return a pre-defined JSON response without calling a real AI.

If you choose a service that provides an API key, you will need to set it in your `.env` file:
`AI_API_KEY="your_key_here"`

**3. Email Provider (Free SMTP)**

You can use a service like Mailgun or SendGrid which offer free tiers for a limited number of emails per month.

- **Sign up for a free account** on a provider like Mailgun.
- **Verify your domain.** This is a necessary step to be able to send emails.
- **Get your SMTP credentials.** They will look something like this:
  - Host: `smtp.mailgun.org`
  - Port: `587`
  - Username: `postmaster@yourdomain.com`
  - Password: `a_long_secret_password`

- **Set these credentials in your `.env` file:**
  `SMTP_HOST="smtp.mailgun.org"`
  `SMTP_PORT="587"`
  `SMTP_USER="your_username"`
  `SMTP_PASS="your_password"`
  `MAIL_FROM="you@yourdomain.com"`