shojiku

https://github.com/kengos/shojiku

Ruby bindings for Shojiku, a document engine for invoices, receipts and slips. A YAML template plus JSON or YAML params in, a deterministic PDF out, with signing and verification over the result. The layout engine is a shared C library loaded through fiddle, so the same params produce the same bytes here as in the CLI and every other Shojiku SDK.