- Creating a custom validator
- Encryption
- Create and edit custom database rows
- Populating a second form from data saved in the database
- Creating a plugin for custom code
- Enabling debug logging
- Migrating custom code from Quform 1.x
- Signature field
- Adding a form data preview page
- Calculations
- PayPal
- Stripe
- WPML
- Translating the plugin
- PHP class documentation
