Most of a Candy Rack project is planning. Deciding which offer appears, where, and next to which product takes the time, and it's what experts are paid for.
An offer map. The app can show embedded offers on the product page before purchase, cart offers, a checkout offer and post-purchase offers. A good expert assigns each product line to the placement that suits it, so nobody sees the same add-on three times on the way to paying.
Upgrades or add-ons. An upgrade swaps in the better version of what's already chosen. An add-on sits alongside it: a case, a refill, a spare. Upgrades suit products with clear tiers; add-ons suit accessories. Use the wrong type on a product and shoppers skip past the offer.
Volume bundles. Tiered quantity pricing on the product page — two for less each, three for less again. The expert's job is setting tiers so the discount still leaves margin at every step, rather than copying round numbers.
The cart drawer. Candy Rack's slide-out cart carries its own offers and rewards. If your theme already opens a cart drawer, someone has to decide which one stays, then make sure only that one appears on desktop and mobile.
AI mode and testing. AI mode lets the app choose upsells itself. That helps on a large catalogue; with a dozen products, hand-picked offers are usually sharper. A/B testing runs through an integration with a separate testing app, so an expert can put AI picks against manual ones and keep whichever wins.