Inside HIFI CREDIT's borrower loan account

Every HIFI CREDIT loan carries a fixed daily interest figure — 0.05% a day, as the app's own Play Store listing puts it — accruing against a principal that the listing describes as roughly 1,000,000 to 30,000,000 VND across a 91-to-360-day term. That is the data worth reaching: not a static loan amount, but a server-side ledger that changes every day a loan is open. The listing even walks through the arithmetic — 1,000,000 VND at 0.05% over 120 days is 60,000 VND of interest, a 1,060,000 VND payoff. Reproducing that number on demand, per borrower, is the integration.

HIFI CREDIT is a non-bank lender. It does not sit inside the State Bank of Vietnam's bank-facing Open API catalog, so there is no aggregation endpoint to subscribe to. The data is reachable, though — it lives behind the borrower's own login, in the same calls the app makes. We map those calls under the borrower's authorization and hand back a clean interface to the loan record. That is the route we would take here, and the rest of this page is about how.

What sits behind the login

The app holds a small, well-shaped set of per-borrower records. None of it is exotic; the value is in getting it out structured and current.

Reaching it: the routes that apply

Two routes genuinely fit an app like this, plus a fallback. We pick by what the borrower has agreed to and what the app exposes during a session.

1 · Authorized interface integration of the app's traffic

We observe the calls the HIFI CREDIT client makes during a consenting borrower's session — login, loan fetch, repayment fetch — and rebuild them as a documented interface. Reachable: the full loan record above. Effort is moderate; the surfaces are few and the loan math is fixed. Durability depends on the app's release cadence, which we account for with fixtures (see the engineering notes). Onboarding access is arranged with you — a consenting account or a test borrower the project uses to capture and validate the calls.

2 · User-consented credential access

Where the use case is a borrower wanting their own data moved somewhere — a personal finance tool, a debt-tracking service — the borrower consents and authenticates, and we run the pull on their behalf. Reachable: the same record, scoped to that one borrower. This is the cleanest fit with the Vietnamese consent rules below, since the data subject is in the loop on every pull.

3 · Native export as a fallback

If the app or its support channel can produce a statement or a data copy, we parse it into the same schema. Lower fidelity than a live pull — a snapshot, not a feed — but useful for backfilling history before a live sync goes in.

For HIFI CREDIT the honest pick is route 1 driven by route 2's consent: a live interface to the loan and repayment calls, run only on accounts whose holder has agreed. The loan set is too small and too time-sensitive for a static export to carry, and there is no bank endpoint to lean on, so the app's own session is where the current numbers are.

A worked pull against the loan ledger

This is the shape of the live route, reduced to the two calls that matter. Field names and paths are confirmed during the build, not guessed; the host is redacted here.

# Illustrative — auth then loan fetch, normalized on the way out.
import requests

BASE = "https://api.hificredit.example"   # captured host, redacted

def login(phone, otp):
    r = requests.post(f"{BASE}/api/v1/auth/token",
                      json={"phone": phone, "otp": otp})
    r.raise_for_status()
    return r.json()["access_token"]        # short-lived bearer; refresh below

def active_loan(token):
    r = requests.get(f"{BASE}/api/v1/loan/active",
                     headers={"Authorization": f"Bearer {token}"})
    r.raise_for_status()
    return r.json()

# Normalized loan record (Vietnamese fields mapped to stable English keys):
# {
#   "loan_id":             "...",
#   "principal_vnd":       1000000,
#   "daily_rate":          0.0005,      # 0.05%/day, per the app listing
#   "term_days":           120,
#   "accrued_interest_vnd": 60000,      # principal * daily_rate * days_elapsed
#   "payoff_vnd":          1060000,     # matches the listing's worked example
#   "due_date":            "2026-10-21",
#   "status":              "active"     # mapped from "dang_vay"
# }

The accrual line is the one to get right. We compute it the same way the listing does and check the result against what the app shows on the same date — if the two disagree, the build is wrong, and a test catches it before you ever see it.

What lands at handover

The deliverable is a working integration of the surfaces above, not a report about them. For HIFI CREDIT that means:

• An OpenAPI (Swagger) spec covering the auth, active-loan and repayment calls, with the normalized loan schema as the response model.
• Runnable source for those endpoints in Python or Node.js — the login, the token refresh, the loan and payment-history pulls, and the accrual reconciliation.
• A protocol and auth-flow report: how the bearer token is issued and refreshed, session lifetime, and the cookie or header chain the client relies on.
• Automated tests, including a fixture that pins the worked example (1,000,000 VND → 1,060,000 VND over 120 days) so accrual drift is caught.
• Interface documentation in English, plus data-retention and consent-logging guidance matched to the Vietnamese rules below.

The Vietnamese data rules that shape the build

Vietnam's open-banking framework — Circular 64/2024/TT-NHNN from the State Bank of Vietnam, in effect from 1 March 2025 per the coverage we read — sets a consent-centric, phased Open API regime for banks. HIFI CREDIT is not a participating bank, so the integration does not ride that catalog. What governs it instead is the personal-data law: Decree 13/2023/ND-CP, and the Personal Data Protection Law that takes effect on 1 January 2026. Both make the borrower's explicit, purpose-specific consent the basis for processing, bar pre-ticked or implied consent, and require that revocation be honored.

So the build is scoped to that consent. We pull only the loan fields a stated purpose needs, log each access against the consent record, and design revocation as a real stop — when a borrower withdraws, the sync ends and the retention clock starts. NDAs are in place where the engagement touches the lender's own systems. This is how we operate, not a hurdle put in front of you.

Engineering details we plan around

Two things about this specific app drive the design, and a couple more we handle as a matter of course.

• The accrual clock. Interest moves at 0.05% per day, so a payoff figure is only correct for one date. We pin the accrual to the lender's timezone (ICT) so day boundaries line up, and we refresh payoff figures daily rather than caching them — a stale number here is a wrong number.
• Outside the bank perimeter. Because there is no SBV Open API endpoint for a non-bank lender, the integration depends on the app's own session. We map its token issuance and refresh carefully so a long-running sync does not drop mid-loan, and we keep the auth flow isolated so a change there does not ripple through the data calls.
• Vietnamese UI copy. Statuses and labels arrive in Vietnamese and can change wording between releases. We map them to stable English keys during normalization, so your systems bind to the key, not the screen text.
• Front-end churn. When the app updates its screens, we re-check the captured calls against a saved fixture, so a layout or field change surfaces as a failing test rather than a silent gap in the feed. Access for that re-check is arranged with you during onboarding, against a consenting account.

Keeping the sync current

Payoff and accrued-interest fields are refreshed daily for any open loan, because the daily rate makes anything older than that wrong by construction. Static fields — principal, term, due date — are pulled once at loan open and re-validated on change. Pulls are idempotent and keyed on loan id, so a retried sync never double-counts a payment. If the app ships an update that moves a call, the fixture tests flag it the same day.

Cost and how we work

A working HIFI CREDIT integration — runnable source for the loan and repayment calls, the OpenAPI spec, and the accrual tests — ships in one to two weeks. Source-code delivery starts at $300, and you pay it after the code is in your hands and it works, not before. If you would rather not host anything, the second option is our pay-per-call API: you call our endpoints, you pay only for the calls you make, and there is no upfront fee. Either way, all we need from you to begin is the app name and what you want out of its data; access and the consent side are arranged together. Tell us which fits and we will scope it — start the conversation here.

How this brief was put together

Reviewed on 2026-06-23 against the app's Play Store listing for the loan terms and worked example, and against current Vietnamese regulatory coverage for the data rules. The routes and schema reflect how an app of this shape is integrated; field names are confirmed during a build. Primary sources:

• HIFI CREDIT — Google Play listing
• Circular 64/2024/TT-NHNN and Vietnam's Open API regime (Brankas)
• SBV draft Open API circular — phases and consent (Tilleke & Gibbins)
• Vietnam's Personal Data Protection Law (Hogan Lovells)

OpenBanking Studio integration desk · mapping reviewed 2026-06-23.

Screens we worked from

The app's own screens, as published on its store listing. Tap to enlarge.

Other Vietnamese lending apps in scope

HIFI CREDIT sits in a crowded consumer-credit field. A single integration layer over several of these gives a host system one schema across many lenders. Named here for context, not ranked:

• Home Credit (Home Credit Tài Chính Online) — installment and cash loans with larger ticket sizes; per-borrower account holding a repayment schedule and balance.
• FE Credit (FE ONLINE 2.0) — unsecured cash loans on declining-balance interest; a customer loan dashboard with tenor and rate.
• MoMo — e-wallet with embedded lending; holds wallet balance, transaction history and loan offers per user.
• Cake by VPBank — digital bank offering cash loans; account, card and loan ledgers behind one login.
• Tima — peer-to-peer lending marketplace matching borrowers to lenders; application and disbursement records per request.
• Doctor Dong — short-term online cash loans; borrower profile, loan amount and repayment due date.
• Vietdong (Vay nhanh online) — unsecured short-term lending; per-user application and live loan status.
• RoboCash — instant online disbursement; borrower account carrying fees, schedule and payout timing.

Questions integrators ask about HIFI CREDIT

Does the integration cover the daily 0.05% interest accrual, or only the headline loan amount?

It covers the accrual. We model the per-day interest the same way the app's listing describes it, so a payoff figure pulled on a given date matches what the borrower sees that day, not just the original principal.

HIFI CREDIT is not a licensed Vietnamese bank — does that change how you reach the data?

It does. A standalone non-bank lender sits outside the State Bank of Vietnam's bank Open API catalog, so we build against the app's own client-server interface under the borrower's authorization rather than a bank aggregation endpoint.

The app's screens and statuses are in Vietnamese — what format does the data arrive in?

We normalize the Vietnamese field labels and loan statuses to a stable English schema during mapping, so your downstream systems read consistent keys instead of UI copy that can shift between app versions.

Which Vietnamese data rules govern a HIFI CREDIT integration?

Decree 13/2023/ND-CP and the Personal Data Protection Law that takes effect on 1 January 2026, both consent-centric. Access runs on the borrower's explicit, purpose-specific consent, with revocation honored and processing logged.