Article 120 bis 1 empowers the Tax Authority to use all its domestic investigative and procedural powers to gather information requested under international tax agreements. This means the Authority can demand documents, accounts, or data from any person in Oman specifically to fulfill an international exchange of information request, even if there is no immediate domestic tax liability for that person. This ensures that Oman can effectively respond to queries from foreign tax authorities, maintaining its standing in the global effort to combat international tax evasion and non-compliance.