You can setup promotion cards to encourage your customers to TIP their server...
- Open LOKE Office
- Hit 'New Promotion'
- Hit 'Sell a product'
- Setup promo as usual using 'promotion cost' as the tip amount
- If you leave the photo field blank then the promo box will appear smaller on the home page
- You could set multiple cards e.g. TIP £5, TIP £10, TIP £20