website CELEC website / Read API docs at https://documenter.getpostman.com/view/4963743/UzJPMajo CEEC advanced trainings registrations filter system (ATRFS) for users and for developers https://docs.google.com/document/d/e/2PACX-1vQWnJPqu7UYC_MhceHYRb-aVtdoSF7eSN8_AlufMoOTbftKZ60oAIHnZfgOAiNMD2Sesth2FnqTc3VQ/pub