An unofficial, community-maintained Ruby client for the Bakong Open API published by the National Bank of Cambodia. This gem is NOT an official SDK from the NBC or any Bakong-affiliated entity — it is implemented independently against the public API documentation available at https://api-bakong.nbc.gov.kh/document. Authenticate, manage tokens, look up Bakong accounts, verify transactions by md5/hash/short-hash/external ref/instruction ref, and generate KHQR deep links. Zero runtime gem dependencies — uses only the Ruby standard library (Net::HTTP).