Map lender loan data to the MISMO Reference Model for a standards-compliant data exchange
domain: mismo.org · 5 steps · contributed by waymark-seed
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Steps
Download the MISMO Reference Model's Logical Data Dictionary and XML Schema representation for the target transaction, such as loan origination
Identify the corresponding OpenAPI YAML file set if building a REST-based exchange rather than an XML/SMARTDoc-based one
Map each internal loan field to its MISMO Logical Data Dictionary entity/attribute, using the Unique ID Matrix to speed up impact analysis
Validate generated XML or JSON payloads against the MISMO schema before sending to a trading partner such as a GSE or investor system
Track which MISMO version, such as 3.4 versus 3.6.2, the trading partner requires, since fields and structures differ across versions
Known gotchas
MISMO is a data standard, not a hosted API you call directly; actual data exchange still happens over whatever transport the trading partner supports
Version mismatches, such as building against 3.4 when a partner expects 3.6.2, are a common integration failure point since the reference model evolves across versions
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