One of the most effective way to increase your revenue is it sell more to existing customers. It costs much less than brining new customers onboard.
Cross-sell / Upsell allows you do easily to that. For example:
Skip training your staff weekly for what offers to apply. Promos just work just as you defined them.
Add desired Special Offers in the admin interface.
In Shopify POS, tap cart "..." menu at top-right and choose Apply Special Offers.
Can I set specific start/end times for an offer? How about being applicable only to some customers?
Yes! In the offer details, please see Applicability section.
Upsell popup is shown just once
By default, the app remembers a popup was shown for a product to a customer, and avoids showing popups for the same product for a few hours in order to avoid annoying customers.
You can change the remember duration in Themes > special-offers.liquid, variable window.saso_config.upsell_ttl