Fabric Release Notes | Version 5.8

Summary: Fabric Version 5.8 delivers significant improvements to the UIStreams callback structure, enabling better error classification, retry handling, and smoother integration for merchants. Additionally, we’ve introduced a brand-new Sales Lead Generation Toolkit to help lenders and fintechs discover and act on new business opportunities faster.

Release Highlights

UIStreams Enhancements

Structured Callback Response Keys:
We've redesigned the UIStreams callback system with clearly segregated response keys. Merchants can now easily distinguish between:
- Terminal errors (e.g., document validation failures), and
- Recoverable/intermittent errors that will trigger automatic document retrieval via pollers once the source systems stabilize.
Error Message Transparency:
Callback payloads now include human-readable error reasons to support better troubleshooting. For example:
- "The full name does not match the PAN data."
- "The mobile number is not linked with Aadhaar."
- "The PAN DOB does not match the Aadhaar data."
- "The PAN provided is invalid."

Comprehensive Callback Mapping:
We've documented and standardized all UIStream callback types to simplify integration and error handling. Here's a snapshot:

No	Response Key	Description
1	`success_uistream_documents_fetch`	Complete callback sent with all documents successfully fetched.
2	`success_uistream_partial_documents_fetch`	Partial callback sent without poller initiation due to validation errors (e.g., PAN mismatch).
3	`success_uistream_partial_fetch_with_poller`	Partial callback sent with poller initiation for intermittent/downtime issues, when enabled.
4	`success_uistream_poller`	Callback sent after successful poller fetch, usually containing PAN document data.
5	`error_uistream_poller_retries_exhausted`	Indicates poller retries have failed; merchant needs to take manual action.
6	`event_uistream_session_initiated`	Callback sent when the session begins.
7	`event_uistream_session_termination`	Callback sent when the session ends.
8	`event_uistream_session_timeout`	Triggered after 300 seconds of non-completion. This value is configurable.