Yes, there's two ways you can create a taster, 'first class/session free' offer.
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You can either use the discount code bolt-on feature to create a 100% discount for classes (gated at 1 user per user) and publish / share that. Alternatively, you can create a free 1 class credit bundle for potential customers to purchase and use at booking.
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You may also be interested in:
​Discount codes
​Packages