The Substitution Ad Integration Guide explains what a retailer must provide in order to serve Substitution Ads to their outgoing order pick list. Citrus generates Substitution Ads in a similar way that Citrus serves Post Checkout Banner Ads, Both campaign types are targeted to current cart items. Retailers have control of substitution campaign approval to ensure quality control.
This guide assumes you have already created your catalog, created your products, and are sending customer and order data to Citrus.
In order to request Substitution Ads, you must provide a context. See "The Substitution Ad Context" for more information.