BCEL OneProof is a free Android app developed by BANQUE POUR LE COMMERCE EXTERIEUR LAO PUBLIC. It falls under the category of Business & Productivity, specifically Finance. This app aims to make it easy for users to verify the validity of payments and documents by simply scanning the QR code available on BCEL One receipts such as Transfer, OnePay, PromptPay, WeChat Pay, and Alipay.

The app is designed for everyone, but it is particularly useful for OnePay vendors. With OneProof, vendors can validate all payments automatically, eliminating the need for old-style screenshot taking of phone screens. The app is user-friendly and can be easily accessed on a mobile device, making it convenient for users to verify their payments and documents on-the-go.