You are able to create and offer promo codes to your customers, you can set this up under the "Set Up" page and choose on "Promo Codes" and click "Booking Promo Codes"

Click on the "add new promo code" button:

Where you are able to set up a discount code, discount amount (you can either use $ (amount) or % (percentage) of the service purchased), discount applied - if this can be applied per booking/per person, you are also able to add a description of the discount and you can specify this if this code can only be applied to specific service/s:

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