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Quantum Partner API
RESTful API for integrating lending capabilities into partner platforms
Their llms.txt
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# Quantum Partner API
> RESTful API for integrating lending capabilities into partner platforms
The Quantum Partner API enables partners to submit loan applications (directly or via prefill), manage documents, handle offers, service accounts, and receive real-time webhook notifications. A full sandbox environment is available for end-to-end integration testing.
For a single-fetch bundle of the full documentation and a structured summary of the OpenAPI spec, see [llms-full.txt](https://docs.quantumlends.com/llms-full.txt).
## Documentation
- [Getting Started Guide](https://docs.quantumlends.com/content/getting-started.md): Authentication, first application, common workflows, bank accounts
- [Prefill Applications Guide](https://docs.quantumlends.com/content/prefill-applications.md): Start an application on behalf of an applicant with partial data, then hand off a completion link
- [Bank & Financial Data Guide](https://docs.quantumlends.com/content/bank-data.md): Forward Plaid Asset Reports or Stripe Financial Connections data for cash flow analysis via the `type`-keyed transactions envelope
- [Offers Guide](https://docs.quantumlends.com/content/offers.md): Retrieve offers after underwriting and understand which fields each product type returns (Fee Based LOC, Term LOC, Term Loan, Revenue Based Advance); the offers array is a discriminated union keyed on `loan_type`. Also covers accepting/declining offers and the New York & California requirement to download the commercial financing disclosure before accepting (else acceptance returns 412)
- [Embedded Contract Signing Guide](https://docs.quantumlends.com/content/embedded-signing.md): Embed loan agreement signing in your own UI with the Embedded Signing SDK: Quantum events, CDN install with Subresource Integrity, and iframe/CSP/X-Frame-Options guidance
- [Sandbox Environment Guide](https://docs.quantumlends.com/content/sandbox-environment.md): Sandbox host, magic values, controlling application outcomes, end-to-end test scenarios
- [Migration Guide](https://docs.quantumlends.com/content/migration-guide.md): Upgrading from previous API versions
- [Mutual TLS (mTLS) Onboarding](https://docs.quantumlends.com/content/mtls.md): Optional mutual TLS authentication for enterprise partners with compliance requirements. Layered on top of the standard Bearer-token auth.
- [Webhooks Overview](https://docs.quantumlends.com/content/webhooks-overview.md): Event types and application lifecycle
- [Webhooks Integration Guide](https://docs.quantumlends.com/content/webhooks-guide.md): Technical implementation including HMAC signatures, optional OAuth2 client-credentials Bearer tokens for inbound delivery, and optional per-event delivery filters
- [OpenAPI Spec](https://docs.quantumlends.com/merged-api.json): Machine-readable API specification (OpenAPI 3.1)
## Tools and Examples
- [Sandbox Test Runner](https://docs.quantumlends.com/sandbox-test.html): Browser UI for running end-to-end sandbox scenarios against you
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