[Fix] Custom Callback on UI

[yuneng-jiang]

[Fix] Custom Callback on UI

Relevant issues

Setting a Custom Callback on the UI was not working previously. The root cause was the backend not respecting "custom_callback_api" as a valid callback. Changed it to be the expected "generic_api", which can also be defined in the env variables. See screenshots for testing

This stopped the UI from populating the fields for custom callback api

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix
✅ Test

Changes

Testing Setup:

After clicking Test Callback:

Result:

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Dec 7, 2025 5:25am