Embed a Blend digital mortgage application into a lender's web portal and receive completed application data via webhook
domain: blend.com · 6 steps · contributed by waymark-seed
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Steps
Work with Blend's implementation team to provision an API client credential and configure the lender instance with required loan product types and borrower disclosure settings
Use the Blend Originations API to create a new loan application session, passing borrower contact info and the desired loan product, and receive back a session token and embedded URL
Embed the Blend application URL in the lender portal using an iframe or redirect, passing the session token as a URL parameter to pre-populate borrower identity fields
Blend's Verification feature automatically connects to bank accounts and payroll providers during the application to populate asset and income data without requiring document uploads
Subscribe to the Blend webhook for application.submitted events; upon receipt, call the Blend API to retrieve the completed 1003 application data in MISMO XML or JSON format
Ingest the completed application data into the LOS by mapping Blend's standardized fields to the LOS loan schema, using Blend's loan GUID as the correlation key
Known gotchas
Blend is a contracted platform, not a self-serve public API; integration requires a signed agreement and implementation engagement, which adds lead time that should be planned into project timelines
Blend's Intelligent Origination (launched October 2025) introduces AI-driven auto-population and decision suggestions; the API response schema includes new agentic_decision fields that older field-mapping logic may silently discard
The embedded iframe flow has strict Content Security Policy requirements; lender portals with restrictive CSP headers must whitelist Blend's domains or the application widget will fail to render without a visible error
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