Core Points - The article provides a detailed guide on how to use the electronic tax bureau app for querying and entrusting tax-related professional service institutions [1][2][3]. Group 1: Querying Tax Service Institutions - Users can log in to the electronic tax bureau app and navigate to the "Tax Professional Service Institution Query and Entrustment" section to search for relevant institutions [1]. - The query results can display various institutions based on input criteria, including credit scores and service details [2][6]. - Users can refine their search by entering specific conditions such as evaluation year and location [6][7]. Group 2: Information Access and Entrustment Process - The query results page allows users to view detailed information about each institution, including legal representatives and service counts [9]. - If users wish to entrust a service institution, they can fill out the required service information and save it, which will initiate a confirmation process with the institution [11].

Core Viewpoint - The article provides a detailed guide on how to download and manage electronic invoices through the electronic tax bureau app, emphasizing the importance of digital tools in tax management [7][10]. Group 1: Invoice Download Process - Users can log into the electronic tax bureau app and navigate to the "Invoice Usage" section to access the "Full Invoice Query" feature [7]. - The app offers two query modes: "Full" and "Last 24 Hours," allowing users to select the type of invoice they wish to retrieve [10]. - After entering the required invoice number and conditions, users can view the invoice details, including basic information, seller, and buyer information [10][12]. Group 2: Invoice Delivery Options - The system provides multiple options for downloading invoices, including viewing the invoice, QR code download, PDF download, OFD download, and XML download [13][14]. - Users can choose the download method that best suits their needs, enhancing flexibility in managing invoices [13].