Gale Credit Union API Integration & OpenBanking Data Services

Account login & MFA bridge

We mirror Gale CU's multifactor authentication handshake — the same MFA surfaced in the official online-banking portal — and expose a stable /session endpoint. Credentials, device-binding tokens and biometric session keys are stored encrypted; your callers never see raw secrets. Typical use: a member dashboard that keeps 50+ credit-union logins warm without re-prompting.

Transaction history API

Paginated export of posted and pending activity across share, checking, money market and loan accounts. Fields include posted date, description, memo, check number, amount, running balance and category hints. Used by bookkeepers syncing to QuickBooks Online and by SMB owners reconciling vendor payments on a weekly close.

Balance & eZCard sync

Single call returns current and available balance for every share and loan, plus eZCard credit-card balance, last-statement amount and minimum due. Feeds personal finance management (PFM) tools, real-time cash-flow widgets and automated low-balance alerts for small-business accounts.

Funds transfer & loan payment

Intra-member transfers between deposit and loan accounts, plus scheduled GCU Bill Pay and loan-payment submission. Each operation emits a signed receipt with trace ID so payroll systems and ERP queues can confirm idempotent settlement.

e-Statement retrieval

Structured fetch of monthly e-Statements with year/month filters. PDF bytes are returned alongside a parsed JSON block (account summary, interest posted, fees, period totals) so downstream compliance archives and audit trails can store both the human-readable and machine-readable versions.

Card controls & alerts webhook

Exposes freeze/unfreeze debit-card toggles and subscribes your system to the same event stream that drives in-app email notifications: large withdrawal, low balance, deposit cleared, loan due. Webhook signatures are HMAC-SHA256 so recipients can verify origin.

1. QuickBooks / Xero bookkeeping sync

Context: Galesburg-area small businesses running share-draft checking at Gale CU often pay a bookkeeper to rekey 40–200 transactions per month.

Data & API: /statement pulls the month's posted transactions; our FDX-mapper emits a QuickBooks Web Connect QBO file or a Xero bank-feed payload.

OpenData mapping: FDX transactions resource → QBO STMTTRN records, with memo and category hints preserved. Matches the same exchange pattern Plaid's Core Exchange uses for credit-union Core systems.

2. Multi-institution PFM aggregation

Context: A member uses Gale CU for savings and a national bank for payroll; they want one app to see both.

Data & API: /accounts + /balances + /transactions return a unified account object with ISO-4217 currency, institution ID and last-refresh timestamp.

OpenData mapping: Follows FDX accounts and transactions schemas, so the same code path that wires Alliant or America First Credit Union data also wires Gale CU without bespoke field renaming.

3. Auto-loan payoff & refinance calculator

Context: A fintech offering auto-loan refinancing needs the live payoff amount and next due date from the member's existing Gale CU vehicle loan.

Data & API: /loans/{id} returns principal balance, APR, per-diem interest, scheduled payment and next-due date. /loans/{id}/payoff returns a 10-day payoff quote.

OpenData mapping: Fits FDX loan resource fields; the refi partner can queue an ACH origination file without the member manually uploading a statement.

4. SMB low-balance & fraud webhook

Context: A local retailer wants Slack alerts when the business share-draft account drops below $2,500 or when a debit posts above a threshold.

Data & API: Subscribe to /webhooks/events; we translate Gale CU's email-alert triggers into signed HTTPS callbacks delivering JSON events: balance_low, large_debit, deposit_cleared.

OpenData mapping: Parallels OpenBanking "event notifications" patterns from PSD2 and mirrors the account-event model the credit union already uses internally.

5. Mortgage / loan application document package

Context: An underwriter needs three months of statements, current balances and income deposits for a mortgage application — without asking the member to screenshot the app.

Data & API: /estatements?from=YYYY-MM returns PDF + parsed JSON; /transactions?category=deposit returns payroll-like inflows.

OpenData mapping: Directly supports Section 1033 "personal financial data rights" workflows: the member authorizes data sharing, the underwriter receives a signed document bundle within seconds.

Deliverables checklist

• OpenAPI 3.1 specification for every exposed endpoint
• Protocol & auth-flow report: device binding, MFA, session refresh
• Runnable source in Python (FastAPI) or Node.js (Express)
• FDX / Core Exchange mapping layer and example clients
• Integration tests, Postman collection, webhook simulator
• Compliance guidance: Section 1033, GLBA, NCUA supervisory expectations

Session & MFA (pseudocode)

POST /api/v1/gale-cu/session
Content-Type: application/json

{
  "member_number": "******1234",
  "password": "<user_secret>",
  "device_fingerprint": "dfp_8c91...",
  "mfa": { "channel": "sms", "code": "482190" }
}

200 OK
{
  "session_id": "ses_01HE...",
  "expires_in": 1800,
  "mfa_required": false,
  "fdx_consent_id": "cns_2025...",
  "scopes": ["accounts:read","transactions:read","loans:pay"]
}

Transaction statement (FDX-aligned)

GET /api/v1/gale-cu/accounts/{id}/transactions
  ?fromDate=2025-09-01&toDate=2025-09-30&status=posted
Authorization: Bearer <ACCESS_TOKEN>

200 OK
{
  "accountId": "acc_7788",
  "page": 1, "pageSize": 50, "total": 132,
  "transactions": [
    {
      "transactionId": "tx_0001",
      "postedTimestamp": "2025-09-28T14:02:11Z",
      "amount": -42.17,
      "currency": "USD",
      "description": "HY-VEE GALESBURG IL",
      "category": "Groceries",
      "checkNumber": null,
      "runningBalance": 3184.22
    }
  ]
}

Loan payoff & webhook event

GET /api/v1/gale-cu/loans/{id}/payoff
Authorization: Bearer <ACCESS_TOKEN>

200 OK
{
  "loanId": "ln_4412",
  "principalBalance": 12480.55,
  "apr": 6.49,
  "perDiemInterest": 2.22,
  "payoffAmount": 12502.77,
  "quoteValidUntil": "2025-10-15"
}

// Webhook (HMAC-SHA256 signed)
POST https://yourapp.example/hooks/gale
X-Signature: t=...,v1=...
{
  "event": "deposit_cleared",
  "accountId": "acc_7788",
  "amount": 1850.00,
  "currency": "USD",
  "timestamp": "2025-10-03T18:22:05Z"
}

About our studio

We are an independent technical studio specializing in App interface integration and authorized API integration for fintech and OpenBanking use cases. Our engineers have worked on U.S. credit-union cores, FDX Core Exchange clients, PSD2 TPP servers in the EU, and UPI rails in APAC, giving us practical experience with the biggest open-data frameworks in production today.

• Mobile-banking protocol analysis and safe reverse engineering
• FDX, OFX, OAuth 2.1 and FAPI profile implementation
• Python, Node.js and Go SDK delivery with full test harnesses
• End-to-end pipeline: analysis → build → validation → compliance review
• Two engagement models: Source code delivery from $300 — we hand over runnable API source code and documentation; pay after delivery upon satisfaction. Pay-per-call API billing — access our hosted API endpoints and pay only for the calls you make, no upfront fee.

Contact

Tell us your target data (transactions, balances, e-Statements, loan payoff, webhooks), your expected call volume, and whether you prefer source-code delivery or hosted pay-per-call. We reply within one business day.

Open contact page

All Gale Credit Union integrations are delivered under explicit member authorization and FDX / Section 1033 consent scopes — we never operate outside a documented, lawful data-sharing arrangement.

Engagement workflow

1. Scope confirmation: which Gale CU surfaces you need (balances, transactions, loans, e-Statements, webhooks).
2. Protocol analysis and FDX mapping design (2–5 business days).
3. Build, internal validation and MFA / session-refresh hardening (3–8 business days).
4. Docs, Postman collection, test cases and deployment notes (1–2 business days).
5. Typical first delivery: 5–15 business days end-to-end; member consent cycles may extend this.

FAQ

What do you need from me to start?

How long until the first integration lands?

How do you handle compliance?

Can you host the API for us?