Introduced back in November 2014 as the result of Snapchat's collaboration with Square, Snapcash ended up as a payment service mainly used for trading adult-oriented content online, far from the initial goal of allowing friends and family members to quickly transfer money while using Snapchat.
https://www.notebookcheck.net/Snapchat-will-shut-down-its-peer-to-peer-payment-service-Snapcash-on-August-30.317712.0.html