DocuSign approved our partner integration, so the connector can now
complete a real OAuth2 authorization-code flow. The integration key
has PKCE enabled, so RequiresPKCE is set; the confidential grant still
authenticates the token exchange with Basic auth and replays the
verifier as the documented hardening layer.
A DocuSign user may have access to several accounts, so this replaces
the previous auto-default-account behavior with a Pattern-1 picker:
the user chooses the account after OAuth, the choice is stored on
DocuSignConnectorSettings, and the driver and name resolver resolve
the selected account's data-center base URI from /oauth/userinfo.
Other changes:
- Request the extended scope so the refresh token's 30-day window
rolls on each use; without it the token hard-expires 30 days after
consent and breaks the connection.
- Drop API-key support: DocuSign has no static API key, only OAuth.
- Return ("", nil) from the name resolver on terminal failures so the
source-name worker does not retry a revoked token forever.
- Add a driver test and cassette; the test previously skipped in CI
for lack of a cassette.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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