Article 13 Funding 1. The revenue of the Authority shall comprise the following: a) Any grants and donations made to or for the benefit of the Authority; b) Sums appropriated from the Consolidated Fund for Timor-Leste; c) Fees and levies payable to the Authority pursuant to the present Decree-Law; d) Moneys received in the framework of a competitive selection process for a radiofrequency spectrum licence; e) Moneys received in the exercise of a bank guarantee, bond or any other form of surety issued in favour of the Authority; and f) All other moneys and property which may in any manner whatsoever become payable to, or fully vested in, the Authority in respect of any matter related to its functions, responsibilities and powers. 2. The Authority shall use its revenue for the performance of its functions and responsibilities and the exercise of its powers pursuant to the present Decree-Law, and shall not use such revenue for any other purpose. 3. The Authority may prescribe a regulatory fee payable by registered service providers as a percentage of their gross revenues, which percentage shall, if necessary, be adjusted each year to meet the budgetary requirements of the Authority for the following year, but shall in no event exceed 2%. Of the respective gross revenues. 4. Any regulatory fee applicable pursuant to the preceding paragraph shall: a) Reflect the costs incurred by the Authority in the performance of its functions and responsibilities and in the exercise of its powers, including a reasonable provision; and b) Be set at a minimum amount of $200,000 (two hundred thousand United States dollars) in the case of registered service providers operating a mobile network and/or providing mobile telephony services. 5. The Authority may require payments of the regulatory fee applicable pursuant to paragraph 3 annually or in installments, and prescribe such other procedures, rules and guidelines as necessary for the efficient and effective collection thereof. The Authority may exempt any service provider from paying the regulatory fee set out in paragraph 3 where its gross revenues earned from the provision of telecommunications services are below $20,000 (twenty thousand United States dollars). 6.