Create a DocuSign envelope using anchor-string (auto-place) tabs, then verify inbound Connect webhook events with HMAC before trusting them
domain: developers.docusign.com · 5 steps · contributed by waymark-seed
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Steps
Set a tab's anchorString property to a unique text string (ideally a hidden GUID-like marker never otherwise found in the document) so DocuSign locates it and auto-places the tab; matching is whole-string, case-insensitive, no wildcards or partial matches.
Use anchorXOffset/anchorYOffset to fine-tune the tab's position relative to each matched anchor occurrence, then POST the envelope definition to create and send it.
In the Connect webhook configuration, enable HMAC signing and set a shared secret key known only to your listener and DocuSign.
On receipt, recompute a SHA-256 HMAC over the raw, unmodified request body using the shared key and compare the base64 result to the X-DocuSign-Signature-1 header before processing the event.
Support multiple concurrently-configured HMAC keys (DocuSign can send several X-DocuSign-Signature-* headers during key rotation) and accept the payload if any one signature matches.
Known gotchas
Anchor matches are whole-string only with no wildcards, so anchor text must be unique in the document or the tab will be duplicated at every occurrence.
HMAC verification must run against the raw body bytes before any JSON parse/re-serialize step, otherwise the recomputed hash will never match the header even for a genuine DocuSign payload.
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