WhatsApp is where you talk. kwataverse is where you get paid.
Show the code
https://kwataverse.com/p/naddr1qqghqmrpwd6xjcedvd5xz6tjwvkhsdszyr4sel6p6acl6u0sm27p5swaealmrpaklxlwdpcnkeeq94cyc9mlcqcyqqq8dss9s723f
Point a camera at it. A neighbour across a stall can too.