Loyalty point is a credit value given to your customers on their orders, to make them stick to your restaurant and helps you to convert them as your regular customers. To set your loyalty points, go to Settings--> Loyalty Points. Set your minimum number of loyalty point in Minimum Loyalty Point section. To define your number of loyalty points to offer the percentage, set the Number of Loyalty Points and the value you offer in the section Is equal to

Choose your option to provide your loyalty point in Calculate Loyalty Points On field and select either, item based or cart value based option from the drop down and set your loyalty points. Now select Save to save the changes. 

Add your conditions if any in Terms and Conditions field.