The Voucherify Xamarin .NET Sample Code by Voucherify presents an application that can interact with the API. Accurate usage allows developers to implement coupons and promotions into marketing applications.
In May, PW reported on Gumroad's API that aimed to simplify online transactions. Indeed, the earlier release did move Gumroad towards its goal: "to democratize the ability to sell stuff online." However, Gumroad's latest offer, Platform API, simplifies the online buying process even further. The earlier API required buyers to register for a Gumroad account and required the use of links. The Platform API removes the need for links and buyer accounts. Instead, an entire transaction occurs on the merchant's site.
InviteBox, social referral program, allows merchants, bloggers, developers (and anybody else with a web presence) to refer friends and customers to recommended products. Users can take advantage of pre-determined referral offers (e.g. coupons, promo codes, free products, cash incentives, etc.) or create custom incentive programs. InviteBox offers all the needed moving parts from creating the referral program to implementation, and the analytics to measure success. Users can simply insert a widget into a website or utilize the Reward Callback API.