(9)The legally binding requirements in Mexico therefore comprise a two-tiered structure. The core principles for CCPs set out in the primary rules lay down the high-level standards with which CCPs must comply in order to obtain authorisation to provide clearing services in Mexico. The primary rules comprise the first tier of the legally binding requirements in Mexico. In order to prove compliance with the primary rules, CCPs must submit their internal rules and procedures, their corporate documentation, their methodologies for the calculation of the financial resources and the CCP's liquidity plan to the approval of the competent authorities. Those internal rules and procedures, corporate documentation, the liquidity plan and the methodologies for the calculation of the CCP financial resources comprise the second tier of the legally binding requirements in Mexico, which must provide prescriptive detail regarding the way in which the CCP will meet those standards. The CNBV and the Bank of Mexico assess compliance by the CCP with those standards and with the PFMIs. Once approved by the competent authorities, the internal rules and procedures, the corporate documentation, the liquidity plan and the methodologies for the calculation of the CCP financial resources become legally binding upon the CCP.