Migrate a DocuSign integration from the legacy SOAP API to the REST eSignature API
domain: developers.docusign.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Treat the REST eSignature API as the actively developed, DocuSign-recommended path; the SOAP API is legacy with no new features — verify current sunset status via DocuSign's developer FAQ before committing to a timeline, since no single confirmed hard SOAP sunset date is published.
Replace legacy basic/password authentication with OAuth 2.0 (Authorization Code Grant or JWT Grant) — DocuSign has been actively deprecating legacy basic-auth access across both SOAP and REST integrations, so this is required regardless of which API you land on.
Map SOAP operations to REST equivalents: envelope creation maps to the Envelopes resource's create operation; status/recipient operations map to the Envelopes, EnvelopeRecipients, and EnvelopeDocuments resources under the same envelope path family.
Convert envelope definitions from SOAP's XML schema to the REST API's JSON bodies, including how documents are attached (base64 content in JSON vs. XML/MIME in SOAP) and how tabs/fields are represented as JSON tab arrays instead of XML elements.
Switch client tooling to an official DocuSign REST SDK instead of a SOAP/WSDL-generated proxy, and re-test Connect/webhook payload handling.
Run both integrations in parallel against a demo/sandbox account and compare envelope outcomes (status codes, recipient routing, document rendering) before cutting production traffic over.
Known gotchas
No confirmed hard sunset date for the SOAP API itself was found in current docs — the concrete, dated deprecation actually happening is legacy basic-auth (password) access being retired in favor of OAuth 2.0, not SOAP itself.
SOAP and REST are not fully field-for-field identical — some newer eSignature features (e.g., newer identity verification workflows, Click integration) are REST/JSON-only with no SOAP equivalent.
Migrating auth alone (to OAuth) is not the same as migrating the API surface — an integration can keep calling SOAP endpoints while using OAuth 2.0, so don't conflate the two efforts when planning.
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