A plugin wallet for Snapchat is what you are asking for.
https://www.google.com/search?q=wallet+for+Snapchat
good luck if you want one that allows porn transactions :P
You will not upload or provide Content or otherwise post, transmit, distribute, or disseminate through the Services any material that: (a) is false, misleading, unlawful, obscene, indecent, lewd,
pornographic, defamatory
https://squareup.com/legal/ua
Bad business model to start with
