Core Viewpoint - The article emphasizes the transition of tax payment processes from offline to online through the optimization of the national electronic tax bureau and mobile app, highlighting the importance of the electronic tax bureau app for tax-related tasks [3]. Group 1: Electronic Tax Bureau App Features - The electronic tax bureau app serves as a comprehensive service platform for tax declaration, invoice management, and certificate issuance, making it essential for financial personnel in enterprises [3]. - The app has undergone continuous iterations to enhance user experience, particularly in high-frequency business functions such as invoice data statistics and invoice usage queries [3]. Group 2: Steps for Querying Invoice Data - To query invoice data and usage information, users must log into the electronic tax bureau app, switch to the corresponding enterprise identity, and navigate to the invoice usage section [4][5]. - Users can select the type of invoice and the query period to retrieve specific invoice usage records [9][11].