Recipes for integrators.
Copy-paste ready, RFC 7807-aware, idempotent. Each recipe documents the failure modes you'll actually hit.
Build a real-time pricing dashboard
End-to-end recipe for a pricing dashboard: API fetch with proper auth, idempotency, error envelopes, and a useReducer pattern for the table state.
pricingdashboardintermediateReadMigrate from an existing PPE in 4-6 weeks
The structured migration playbook: parallel pricing, shadow production, cutover. Concrete weekly milestones.
migrationoperationsadvancedReadGet a quote with cURL
The simplest possible pricing request, with idempotency, RFC 7807 error handling, and the trace.
pricingrestbeginnerReadRun a fair-lending sample against your engine
Synthetic-applicant generation, paired-comparison testing, and the analysis pattern for catching disparate-impact issues in pricing rules.
compliancefair-lendingauditReadSubscribe to pricing.computed events
Create a webhook subscription, verify deliveries, and idempotently consume events on your side.
webhookseventsintermediateReadVerify HMAC signatures across languages
The same verification pattern in TypeScript, Python, Go, and Ruby. Constant-time compare; 5-minute timestamp window.
webhookssecuritybeginnerReadWire RateStack to Encompass via MISMO 3.4
The integration recipe: import loans from Encompass, price them, return rates back. Round-trip safety and the field map.
integrationencompassMISMOReadHandle rate limits without exploding
Read the burndown header, back off on 429, alert before exhaustion. The two-line client wrapper that solves it.
apireliabilityintermediateReadReal-time pricing in a React workspace
Debounced live pricing as the user types, with TanStack Query, idempotency, and proper error UX.
frontendreactpricingReadReplay a webhook DLQ entry
When a subscriber goes down, deliveries land in DLQ. Replay them safely with the rate-limited replay endpoint.
webhooksoperationsbeginnerReadImplement a self-serve lock extension flow
Customer-facing lock extension with policy validation, fee disclosure, and atomic state update.
lockpolicyintermediateReadBulk import loans via MISMO 3.4
Idempotent bulk import using fingerprint dedup. Parallel, rate-limited, fail-soft.
importMISMOintermediateReadExport the audit log to S3 for long-term retention
Configure audit-log export, validate signatures and chain hashes externally, retain in S3 with object-lock for tamper-evidence.
auditcomplianceadvancedReadTwo-stage eligibility — pre-flight then price
Use Stage 1 as a UX gate, then run the full ladder against survivors. Cuts perceived latency dramatically.
pricingeligibilityintermediateReadGraphQL: pricing + drill-down in one call
GraphQL shines when you want the quotes and the per-rule trace from a single round-trip. Schema introspection works against /graphql.
graphqlpricingintermediateReadCapture an immutable rate-quote snapshot for disclosure
Snapshot a quote at the moment of disclosure, persist it tied to the LE/CD, and reproduce on demand for audit.
disclosureaudittridReadHistorical replay — reprice as of a prior moment
Reprice any loan using the ratesheet that was active at a given timestamp. Useful for disputes, audit, and lock-day reconstruction.
pricingreplayintermediateReadIssue and rotate API keys
Create scoped keys, rotate without downtime, revoke quickly. The 30-day overlap pattern.
apiauthbeginnerReadSave and rerun scenarios
Per-borrower scenarios you can rerun in one click. Default-scenario-per-LO speeds the daily flow.
scenariospricingbeginnerReadVerify the audit hash chain
Schedule the chain verification endpoint from your monitoring stack. Treat any break as a security incident.
auditsecuritybeginnerRead