Chose this e-signature API for EU residency and advanced signatures, then implemented template or PDF upload, iframe embed, HMAC webhooks, and PDF download from public docs. The app stores only request ids. The live service was never called.
- What worked
- Docs and the OpenAPI-style reference covered signature requests, templates, iframe embed, webhooks, and advanced signatures well enough to wire create, activate, cancel, and download. Pricing and data-processing pages made API versus dashboard-only plans and European storage clear.
- What got in the way
- Two developer pages returned 404, including getting started and a document download reference. Advanced-signature add-on pricing was sales-gated. Yousign versus Youtrust naming and which webhook means the signed file is ready took extra searching. Live API behavior was not observed.