Hastee API integration services (Earned Wage Access · OpenFinance)

Earned-wage balance API

Read the live "available to draw" amount per employee derived from worked hours, contract pay rate and prior advances. Use it inside an HRIS dashboard, manager app or financial wellbeing widget. Field surface includes employee_ref, pay_period_start, accrued_gross, fees_to_date, available_balance.

Advance & repayment ledger

Per-advance records (request time, amount, fee, payout rail, status) plus the matching deduction line that flows back into payroll on the next cycle. This is the dataset accounting and audit teams need for reconciliation, never-miss payroll closure, and IFRS-friendly fee recognition.

Timesheet ingestion adapter

A drop-in adapter that mirrors how Rotageek and Planday already feed Hastee: post shifts and pay rates as they are approved so the available balance updates near-real-time. Useful for retailers and hospitality groups running fast-moving rotas.

Savings & education events

Hastee surfaces savings nudges and a library of money education content. Event hooks let you record completions, savings-goal milestones and content engagement for benefits-platform reward programs or wellbeing scoring models.

Settlement & payments hook

Hastee pays advances over Modulr's API-first connection to UK Faster Payments and SEPA Instant in the EEA, typically in under 10 seconds, 24/7. We expose those payout confirmation events as webhooks so your treasury, fraud, and customer-comms systems can react without polling.

Employer analytics export

Aggregated, anonymised take-up metrics for the HR director or CFO: percentage of workforce active, average advance size, repeat usage, top use-cases. Delivered as a scheduled CSV/Parquet drop or queryable read API.

1. HRIS / payroll vendor sync

An HR-tech vendor (e.g. a Zellis-adjacent payroll suite, mid-market HRIS or workforce management product) wants Hastee's earned-wage and advance data in one pane. Scenario: push approved shifts and contract rates into Hastee, pull back advance and repayment events, post them to the payroll register and surface a "financial wellbeing" tab inside the HRIS. Maps cleanly to OpenFinance "account information service" patterns adapted for payroll-bound data.

2. Accounting & ERP reconciliation

Finance teams in retail and hospitality groups need to reconcile fast-payment advances against the payroll close. Scenario: pull a monthly statement of advances + fees + repayments per employee, transform to Xero / NetSuite / SAP journal lines, and post via the ERP API. Includes an immutable audit log with consent records and Faster Payments transaction IDs.

3. Benefits & wellbeing dashboard

A benefits platform aggregating multiple employee perks wants a single wellbeing score per organisation. Scenario: ingest Hastee anonymised take-up metrics, savings goal completions and education engagement events; combine with pension and EAP data; expose a scored API to HR leaders. Useful for tenders that ask for measurable wellbeing outcomes.

4. Compliance & risk monitoring

Risk teams want oversight of advance frequency by site to detect over-reliance or potential affordability concerns. Scenario: stream withdrawal events into a risk lake, run threshold rules (e.g. >X advances/month per employee or >Y% of accrued balance), open a ticket in the case management tool. Aligns with FCA "Consumer Duty" expectations on vulnerable customer outcomes.

5. Cross-platform unified pay export

Multinationals using more than one earned-wage provider (Hastee in EMEA, DailyPay or Payactiv in the US) want a single export. Scenario: build a normaliser that maps each provider's advance schema to a unified WageEvent object and ships consolidated CSVs to the global payroll team. We deliver the Hastee-side adapter as part of this scenario.

Deliverables checklist

• OpenAPI / Swagger specification for every exposed endpoint
• Authorization & protocol report (token chain, refresh, employer-tenant scoping)
• Runnable source for advance, statement and timesheet APIs (Python / Node.js / Go)
• Webhook handlers for Faster Payments / SEPA Instant settlement events
• Test suite + sample fixtures covering UK and EU pay rails
• Compliance brief (PSD2, UK GDPR, FCA Consumer Duty notes, retention guidance)
• Developer documentation in English, ready to hand to your engineering team

Technical implementation — sample 1: earned-wage balance

// Fetch live earned-wage balance for an employee
GET /api/v1/hastee/balance?employee_ref=EMP-00482
Authorization: Bearer <ACCESS_TOKEN>
X-Employer-Tenant: tenant_acme

200 OK
{
  "employee_ref": "EMP-00482",
  "pay_period_start": "2026-04-01",
  "pay_period_end":   "2026-04-30",
  "accrued_gross":    1842.55,
  "fees_to_date":     7.50,
  "advances_to_date": 320.00,
  "available_balance": 1515.05,
  "currency": "GBP",
  "as_of": "2026-04-28T09:14:21Z"
}

Technical implementation — sample 2: advance request

// Initiate an authorised wage advance
POST /api/v1/hastee/advances
Authorization: Bearer <ACCESS_TOKEN>
Idempotency-Key: 2c1b9e6e-...

{
  "employee_ref": "EMP-00482",
  "amount": 120.00,
  "currency": "GBP",
  "rail": "FASTER_PAYMENTS",
  "consent_id": "cns_8821"
}

201 Created
{
  "advance_id": "adv_71f2",
  "status": "SETTLED",
  "fee": 2.50,
  "settled_at": "2026-04-28T09:14:29Z",
  "rail_reference": "FPS-2026-04-28-91A"
}

Technical implementation — sample 3: settlement webhook

// Webhook from our integration to your platform
POST https://your-app.example.com/webhooks/hastee
X-Hastee-Signature: t=1714295669,v1=...

{
  "event": "advance.settled",
  "advance_id": "adv_71f2",
  "employee_ref": "EMP-00482",
  "amount": 120.00,
  "fee": 2.50,
  "rail": "FASTER_PAYMENTS",
  "rail_reference": "FPS-2026-04-28-91A",
  "occurred_at": "2026-04-28T09:14:29Z"
}

// Verify HMAC, then upsert into your ledger.
// Errors: respond with 5xx for retry, 2xx to ack.

Compliance & privacy

Hastee operates primarily in the UK and EEA, which puts integrations squarely under the Revised Payment Services Directive (PSD2), the UK Open Banking standards, and UK GDPR / EU GDPR. The FCA's Consumer Duty further raises the bar on ensuring advances do not push employees into harm. Our delivery includes documented consent capture, scoped tokens, data-minimised payloads (no raw PAN, hashed employee identifiers when possible), explicit retention windows, and an audit log compatible with regulator review. We never bypass authentication; every integration runs against authorised, employer-enabled flows or documented public APIs.

Data flow / architecture

A typical pipeline looks like this: Hastee mobile / employer admin → authorised API gateway → ingestion service (consent + rate-limit + signature check) → normalised storage (advance, balance, repayment, savings, education events) → downstream output (your HRIS, ERP, analytics warehouse, or a hosted REST endpoint we run on your behalf). Webhooks handle near-real-time settlement events; nightly jobs handle bulk reconciliation extracts.

Market positioning & user profile

Hastee is a B2B-distributed, B2C-experienced product: it reaches employees only via their employer. Its base spans more than 350 enterprises across hospitality (McDonald's, Domino's, Taco Bell), retail (IKEA, Mediamarkt, DIA) and healthcare (Bupa, NHS trusts), with a strong UK and Western-Europe footprint. Users are typically hourly or shift workers on Android and iOS, and the integration buyers are HR directors, payroll leads, benefits platforms and HR-tech ISVs — exactly the audience that values reliable, OpenFinance-aligned data plumbing.

Recent context (last 2 years)

In October 2024 Hastee announced it had reached profitability as earned wage access went mainstream with top employers. In December 2024 Hastee partnered with Loqbox to help users build credit profiles. On 16 June 2025, the Zellis Group acquired Hastee, folding the platform into Zellis' AI-enabled HR, workforce management and payroll suite — which makes a clean, well-documented integration layer more strategic than ever for ISVs, partners and corporate buyers around the Zellis ecosystem.

About us

We are an independent technical service studio focused on App interface integration and authorized API integration. Our engineers come from banking, payments, payroll-tech and protocol-analysis backgrounds. For Hastee specifically, we bring direct experience with PSD2 / Open Banking patterns, Faster Payments / SEPA Instant settlement events, and HRIS / WFM / payroll connectors of the kind Hastee already runs with Rotageek, Planday and the broader 80+ T&A integrations.

• Earned wage access, digital banking, payroll-tech and benefits platforms
• OpenAPI design, security review, threat-modelling and pen-testing support
• Custom Python / Node.js / Go SDKs, webhook handlers and test harnesses
• Full pipeline: protocol analysis → build → validation → compliance
• Source code delivery from $300 — receive runnable API source code and full documentation; pay after delivery upon satisfaction
• Pay-per-call API billing — access our hosted API and pay only per call, no upfront cost; ideal for teams that prefer usage-based pricing

Contact

Send us the target app (Hastee in this case) and your concrete requirements — endpoints, data fields, volumes, target environment — and we will reply with a scope, timeline and quote.

Open contact page

Engagement workflow

1. Scope confirmation: integration scenarios, data fields, target environment (HRIS, ERP, dashboard).
2. Protocol analysis and API design (2–5 business days, complexity-dependent).
3. Build and internal validation against UK Faster Payments / SEPA Instant test cases (3–8 business days).
4. Documentation, sample requests, and end-to-end test suite (1–2 business days).
5. Typical first delivery: 5–15 business days; employer- or third-party approvals may extend timelines.

FAQ

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