You can integrate the booking widget with a specific promotion code.
You can see an example of a booking widget with a specific promotion code here.
You will have to integrate a specific widget code on that page, something like:
<script type="text/javascript" src="https://bookeo.com/widget.js?a=ABCDE123456789&promotion=25off"></script>
You will have to replace:
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the account ID ABCDE123456789 with your unique account ID.
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the promotion code 25off with your promotion code, that you can find in Marketing>Promotions