You can refer to the Announcement of the Ministry of Education on Standardizing Higher Education Accreditation issued by the Ministry of Education, J.F. [2007] No.5. Part of the original text of this document is as follows:
In order to ensure the authority, fairness and accuracy of higher education qualification certification, our department once again reminds all sectors of society that no unit has the right to carry out higher education qualification certification activities except the qualification certification institutions publicized by the National College Student Information Consultation and Employment Guidance Center and the China Higher Education Student Information Network. Individuals or employers applying for certification must go to online publicity agencies to avoid being deceived.