Paysend — Remittance & Card-to-Card API Integration (OpenFinance)

Production artefacts

• OpenAPI 3.0 (Swagger) spec for all implemented endpoints
• Server-side reference implementation (Node.js / Python) with Dockerfile
• Client SDKs (JavaScript, Python, Go) and usage examples
• Webhook consumer example with HMAC verification
• Test plans, mock server and Postman collection

Example: initiate transfer (curl)

curl -X POST 'https://api.your-backend.com/v1/paysend/transfer' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <PROJECT_KEY>' \
  -d '{
    "idempotency_key": "req_20251201_123456",
    "source_currency": "GBP",
    "target_currency": "PHP",
    "amount": 100.00,
    "recipient": {"type":"card","card_number_last4":"4242","holder_name":"MARIA DOE"},
    "purpose": "family_support",
    "metadata": {"order_id":"ORD-9988"}
  }'

Response: {
  "status":"pending",
  "transfer_id":"tx_5f7a9b",
  "locked_rate": 0.0735,
  "estimated_arrival":"2025-12-02T10:20:00Z"
}

Key integration scenarios

Retail remittance, marketplace payouts, cross-border disbursements, card top-ups, FX hedging for locked rates, and merchant settlement automation.

Security & Compliance

We design integrations with privacy and regulator controls in mind: tokenization for card data, audit trails, configurable retention policies, and optional PCI-scoped modules. Recommendations include PCI-DSS hardened storage, KYC/AML screening hooks, and alignment with local regulator expectations such as FCA / PSD2 patterns where applicable.

Performance & Observability

• Rate-limiting adapters and progressive backoff
• Structured logging and distributed tracing examples
• Health endpoints, synthetic tests and SLA notes

How to engage: API integration steps

1. Share target flows (transfer types, expected volumes, rails to support).
2. We perform protocol analysis & mapping (3–5 business days).
3. Deliver API spec & proof-of-concept mock server for validation.
4. Develop production implementation, run integration tests and security review.
5. Handover: source code, SDKs, OpenAPI, test suite and runbook.

Typical delivery: 5–20 business days depending on scope and partner approvals.

About our studio

We are a technical service studio focused on App interface integration and authorized API integration. Core expertise: fintech protocol analysis, OpenData/OpenFinance integration, third-party gateway onboarding and developer-grade deliverables. We deliver secure, auditable source code and documentation to help teams go live quickly and remain compliant.

• Cross-platform experience: Android & iOS protocol flows
• Languages: Node.js, Python, Go; OpenAPI / Postman / Swagger
• Security-first: PCI patterns, KYC/AML hooks and consent logs
• Transparent pricing & fast-pay options — start from $300

Contact & Next Steps

Provide your target app package ID (you already provided: com.paysend.app), expected endpoints (e.g. transfers, quotes, webhooks), and whether you need hosted connector or self-hosted source. We will respond with a proposal and a sample PoC plan.

Open Contact Page

Common questions

Do you reverse-engineer? We perform authorized protocol analysis and data extraction only on public or consented channels. We avoid any unsafe terms; we refer to that work as "protocol analysis" or "data extraction under authorization".

Will you sign an NDA? Yes — we can sign NDAs and provide SOC/ISO artefacts on request.