You can create discount codes within LetsReg, to provide eligible customers with either a percentage or fixed amount discount from the full price.
If the promotional code box is not displaying within your registration form, please navigate to Settings.
Underneath Page options, ensure that Enable discount codes to be used is ticked. There are also further options;
Show on checkout page means the customer will see a record of the code applied after finishing their registration
Mandatory means the code must be entered on the registration form.
Once the discount code has been added, it will be visible at the end of the customer-facing registation form: