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Changes to the Pylon Developer Platform API, newest first. Subscribe with the RSS button above.
  • Minor change: a change to existing behavior that most integrations absorb without modification. Announced at least 2 weeks before it takes effect.
  • Major change: a change likely to require an update to your integration. Announced at least 4 weeks before it takes effect.
Minor change

Changed

  • Loan notes: we’re introducing a 10,000-byte limit on the notes value accepted by submitUnderwritingNotes and attachLoanNote, taking effect no earlier than September 22, 2026. The limit is measured as UTF-8 encoded length. Plain ASCII text fits 10,000 characters; accented characters use 2 bytes each and most emoji use 4. Once enabled for your account, a longer notes value will return the error code LOAN_NOTE_TOO_LONG, and the request will be rejected. Today, notes of any length are accepted via API request. We recommend truncating or splitting note content that exceeds the limit, and handling LOAN_NOTE_TOO_LONG if you surface API errors to your users.

Fixed

  • Loan notes: notes that exceed the underlying storage limit now return LOAN_OPERATION_ERROR rather than LOAN_INVALID_STATE, which more accurately describes the failure. This applies to all customers and is not gated by the rollout above.