Grow Mobile Banking API integration (FDX / OpenBanking)

1. Account discovery API

Returns the full list of share, share-draft, loan and credit-card accounts the member holds at Grow Financial, including masked account number, product type, ownership and current balance. One call replaces the manual screen scrape of the "Customize Your View" account dashboard and feeds reconciliation in QuickBooks, Xero or NetSuite.

2. Transaction history API

Streams posted and pending transactions per account with normalized fields: amount, currency, postedDate, description, merchantCategoryCode, balanceAfter. Used by accounting platforms for daily ledger sync and by lenders for cash-flow underwriting under CFPB 1033 consumer-permissioned data sharing.

3. Statement download API

Resolves a month/year to a PDF statement plus a parallel JSON breakdown (opening balance, closing balance, fee summary, interest accrued). Drives mortgage and small-business loan applications that need 3–12 months of statements without member email back-and-forth.

4. Alert & notification webhook

Subscribes to the same event classes the app surfaces — large debit, low balance, direct-deposit posted, card-not-present transaction, e-statement ready. Each event is a signed webhook so a fraud-monitoring or treasury-cash-positioning system can act without polling.

5. Personal Money Manager (PFM) read API

Exposes savings goals, budget categories and progress percentages as read-only objects. Useful for embedded financial-wellness modules in payroll, HR-benefits and student-finance apps where the member already trusts Grow with their primary checking account.

6. Card & transfer controls

Wraps the in-app card lock/unlock, travel notice and internal-transfer endpoints. We expose them as idempotent POST calls with explicit member-consent tokens so a partner app can let the member freeze a lost card or move funds to a savings sub-account from outside the Grow UI.

Small-business accounting sync

A Tampa-based contractor uses Grow Financial for the operating checking account and QuickBooks Online for books. Our connector pulls the transaction-history API every two hours, normalizes description into vendor names, and posts to QBO via its own OAuth token. The business avoids manual CSV uploads and the bookkeeper reconciles in minutes. This is the canonical CFPB Section 1033 consumer-permissioned data-sharing pattern.

Cash-flow underwriting for auto loans

A regional auto-lender wants 90 days of bank statements to underwrite a used-car loan. Instead of asking the member to email PDFs, the lender embeds an FDX-style consent screen pointing at our Grow connector. After consent, the lender pulls the statement-download API plus the transaction history, runs cash-flow analytics, and decisions the loan in under 60 seconds.

Financial-wellness coaching for employers

An HR-benefits vendor offers financial coaching to credit-union members through their employer. The PFM read API surfaces savings goals and progress, while the transaction stream feeds spending-pattern analysis. The coach app reads, never writes — every call carries a scoped token tied to the member's session, mirroring the app's own permission boundaries.

Real-time fraud monitoring

A security partner subscribes to alert webhooks (card-not-present, large-debit, login-from-new-device). The webhook is HMAC-signed and idempotent. The partner correlates events across hundreds of credit-union members and pushes a card-lock back through the card-control API in seconds when a confirmed fraud signal fires.

Multi-institution member dashboard

A fintech aggregator wants to give members a unified view across Grow Financial, an external brokerage and a fintech wallet. We expose Grow data as an FDX-conformant data-provider node so the aggregator's existing FDX client (already wired to Mountain America, UW Credit Union and Navy Federal) drops Grow in without bespoke schema work.

1. Member-consent OAuth flow

POST /oauth/token
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code
&code=AC_4f8b...
&client_id=ofl-grow-prod
&code_verifier=<PKCE_VERIFIER>
&redirect_uri=https://partner.example.com/cb

200 OK
{
  "access_token": "eyJraWQ...",
  "refresh_token": "rt_2c1...",
  "token_type": "Bearer",
  "expires_in": 1800,
  "scope": "accounts:read transactions:read statements:read"
}

2. Transaction history (FDX-style)

GET /fdx/v6/accounts/{accountId}/transactions
   ?startDate=2026-02-01&endDate=2026-04-30
   &offset=0&limit=100
Authorization: Bearer <ACCESS_TOKEN>
Accept: application/json

200 OK
{
  "transactions": [
    {
      "transactionId": "t_91f2",
      "postedTimestamp": "2026-04-29T14:21:08Z",
      "amount": -42.18,
      "currency": "USD",
      "description": "PUBLIX SUPER MKTS",
      "merchantCategoryCode": "5411",
      "status": "POSTED",
      "balanceAfter": 1842.55
    }
  ],
  "page": {"offset": 0, "limit": 100, "total": 743}
}

3. Alert webhook (signed)

POST https://partner.example.com/grow/webhook
Content-Type: application/json
X-OFL-Signature: t=1714400000,v1=8f2c...
X-OFL-Event: account.large_debit

{
  "eventId": "evt_8a23",
  "eventType": "account.large_debit",
  "occurredAt": "2026-05-08T12:01:44Z",
  "memberRef": "mem_3f1c",
  "accountId": "acc_881",
  "amount": -1250.00,
  "currency": "USD",
  "context": {"merchant": "DELTA AIR LINES"}
}

# Verify: HMAC-SHA256 over `t.body` using the shared secret.
# Reject if |now - t| > 300s (replay window).

4. Statement download

GET /fdx/v6/accounts/{accountId}/statements/2026-04
Authorization: Bearer <ACCESS_TOKEN>
Accept: application/pdf

200 OK
Content-Type: application/pdf
Content-Disposition: attachment;
  filename="grow-statement-2026-04.pdf"

# Or request `Accept: application/json` to receive a
# parsed summary: opening balance, closing balance,
# total credits/debits, fee schedule and interest accrued.

US regulatory alignment

Grow Financial is a federally chartered credit union insured by the National Credit Union Administration (NCUA). Our integration patterns track the CFPB Section 1033 Personal Financial Data Rights rule and the FDX API standard the CFPB has recognized as a qualified standard-setting body. The 1033 rule remains under reconsideration in 2025–2026, so we design every connector to be re-pointable as the final rule lands and tiered compliance dates phase in.

Privacy & security controls

Member consent is captured per scope, not per session, and stored as an audit-grade record (time, IP, scope, expiry). Tokens are short-lived; refresh tokens rotate; no member password is ever stored at rest. We follow data-minimization defaults — partner integrations receive only the fields they declared in their consent screen — and offer GLBA-aligned and CCPA/CPRA-aligned data-handling annexes for state-resident members. NDAs and processor agreements are signed before any production data flows.

Alliant Credit Union

A national digital-first credit union ranked highly for mobile experience. Common ask: unify Alliant transaction exports with Grow Financial under a single FDX-style aggregation feed.

Navy Federal Credit Union

The largest US credit union, serving military families. Holds checking, savings and auto-loan data with deep transaction histories — partners often want cross-institution payroll and auto-loan reconciliation.

Mountain America Credit Union

A Western US credit union and active FDX participant. Useful as a reference for credit-union-side FDX implementation patterns when designing a Grow connector.

Bethpage Federal Credit Union

One of the largest US credit unions outside Navy Federal, with strong checking and HSA volumes. Aggregator partners frequently group Bethpage and Grow under "regional credit-union" data products.

UW Credit Union

Wisconsin-based, member of FDX. Relevant for student-finance integrations where members co-hold accounts at Grow Financial after relocating to Florida or the Carolinas.

Suncoast Credit Union

A Florida peer of Grow Financial with overlapping membership geographies. Joint dashboards across Suncoast and Grow are a recurring request from regional fintechs and HR-benefits vendors.

MIDFLORIDA Credit Union

Another Florida credit union with significant membership in Tampa Bay. Same data shapes — checking, savings, auto loans — and the same FDX-aligned consent expectations.

Florida Credit Union (FCU Anywhere)

Operates the FCU Anywhere mobile and online banking platform. Relevant to integrators who want a Florida-wide credit-union footprint alongside Grow Mobile Banking.

A+ Federal Credit Union

Education-sector credit union with mobile check deposit and bill-pay APIs. Often paired with Grow when partners build cross-state education-and-public-service portfolios.

Ally Bank & Bank of America (Erica)

National digital-banking apps frequently held alongside a credit-union primary. Ally for high-yield savings and Bank of America's Erica assistant define the UX bar that credit-union members compare Grow's app against.

About OpenFinance Lab

We are an independent technical studio focused on mobile app interface integration and authorized API integration in the OpenData / OpenFinance / OpenBanking space. The team blends ex-bank engineers, mobile reverse-engineering specialists and cloud platform builders who have shipped FDX-aligned and PSD2-aligned connectors across North America, Europe, India and Southeast Asia.

• Credit-union and community-bank API connectors (FDX, CFPB 1033)
• Cross-border OpenFinance for retail, payroll and SMB workflows
• Custom Python / Node.js / Go SDKs and end-to-end test harnesses
• Source-code delivery from $300 — pay after delivery upon satisfaction
• Pay-per-call hosted API — usage-based pricing, no upfront fee

Contact

For quotes or to submit your target app and requirements, open our contact page:

Contact page

Two engagement models: source-code delivery (pay on satisfaction) or pay-per-call hosted API access. NDAs and data-processing agreements available on request.

Engagement workflow

1. Scope confirmation: which surfaces (login, transactions, statements, alerts) and which downstream consumer you are wiring.
2. Protocol analysis & API design (2–5 business days, complexity-dependent).
3. Build and internal validation against a test member account (3–8 business days).
4. Documentation, sample clients and automated regression tests (1–2 business days).
5. Typical first delivery: 5–15 business days. NCUA-side or vendor approvals may extend timelines.

FAQ

Is Grow Mobile Banking integration compliant with US open banking rules?

What member data can be exposed via the API?

How long does delivery take?

Do I need official Grow Financial credentials?