The /auth/v3/tenant_access_token/internal endpoint, like the OAuth token
endpoints, returns code, msg, tenant_access_token, and expire at the top
level of the JSON response — NOT nested under a 'data' key.
FeishuAPIResponse<TenantAccessTokenData> decoded successfully but with
data=nil (extra fields silently ignored by JSONDecoder). The guard then
threw FeishuError.apiError(code: 0, message: 'ok') — appearing to succeed
but always failing. This blocked the subsequent OAuth token exchange call.
- Added code/msg fields to TenantAccessTokenData
- tenantAccessToken() now decodes TenantAccessTokenData directly and
checks data.code != 0 instead of going through FeishuAPIResponse
Co-Authored-By: Claude <noreply@anthropic.com>
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