The counseling requirements for HECMs are contained in Handbook 4235.1 Home Equity Conversion Mortgages, Chapter 2 and supplemented by Mortgagee Letters.
Handbook 4235.1 Home Equity Conversion Mortgages ; Handbook 7610.0 HECM Protocol and Handbook 7610.1 Rev.5 Housing Counseling Program Requirements are available at: https://www.hud.gov/program_offices/administration/hudclips/handbooks/hsgh
HECM Mortgagee Letters are available at: https://www.hud.gov/program_offices/housing/sfh/hecm/hecmml
HECM Counselor Resources - Neighborworks America:
Information for Housing Counselors is available at: https://www.hudexchange.info/programs/housing-counseling/