Where to buy a AAT level 3 certificate? buy certificate, buy diploma. The Association of Accounting Technicians, or AAT, is a UK qualification and professional body for vocational accountants, with over 133,000 members worldwide. It was created by the merger of two founding institutes in 1980: the Institute of Accounting Staff (then a subsidiary of ACCA) and the Association of Technicians in Finance and Accounting (then a subsidiary of CIPFA). Where to buy a AAT level 2 certificate? It is a technician level qualification offering higher apprenticeships which entitles those who have completed the exams and obtained relevant supervised work experience to become an accounting technician. The AAT is based in London, but has branches with membership all over the UK and the rest of the world including Hong Kong and South Africa. Buy AAT certificate, buy fake diploma.