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Group 1 - The article provides a step-by-step guide on how to use the electronic tax bureau app for issuing value-added tax invoices [5][7][21] - It outlines the process of logging into the app, switching identities if necessary, and navigating to the invoice issuance section [2][3][5] - The article details the types of services available for invoice issuance, including general services, real estate leasing, construction services, and transportation services [9][14] Group 2 - The process includes adding buyer information, project details, and confirming tax information before submission [13][14] - It explains the three possible outcomes after submitting an invoice application, including automatic issuance, payment requirements, and the need for tax authority review [20] - Finally, it describes how to check the status of the application and download the issued invoice [21]