SimpleNexus · Authentication Profile

Simplenexus Authentication

Authentication

SimpleNexus secures its APIs with oauth2 across 1 declared security scheme, as derived from its OpenAPI definitions.

CompanyMortgageLendingFintechFinancial-ServicesHomeownershipReal-EstateWebhook

Methods: oauth2 Schemes: 1 OAuth flows: API key in:

Security Schemes

OAuth2 oauth2

Source

Authentication Profile

generated: '2026-07-21'
method: searched
source: https://developer.ncinomortgage.com/mortgage/docs/authentication-1
docs: https://developer.ncinomortgage.com/mortgage/docs/authentication-1
note: >-
  SimpleNexus's API is now delivered as the nCino Mortgage API, which explicitly
  "replaces the legacy SimpleNexus API." The new API uses OAuth 2.0. Exact grant
  type, token endpoint, header format, and scope list were not exposed in the
  public docs excerpt (they sit behind the Authentication and "Obtaining API
  Credentials" guides). Captured at the type level from the published docs; not
  fabricated beyond what the provider states.
summary:
  types: [oauth2]
  oauth2_flows: []          # documented as an "Authorization Flow" but the specific grant was not published in the excerpt
  api_key_in: []
schemes:
  - name: OAuth2
    type: oauth2
    documented: true
    token_expiration: true   # docs state tokens expire (improvement over legacy SimpleNexus API)
    credentials: API Credentials issued via the developer portal
    credentials_docs: https://developer.ncinomortgage.com/mortgage/docs/obtaining-an-api-key
    sources: [https://developer.ncinomortgage.com/mortgage/docs/authentication-1]
legacy:
  name: SimpleNexus API (v0-SNAPI)
  status: deprecated
  reference: https://developer.ncinomortgage.com/mortgage/v0-SNAPI

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