Overseas App API Integration & Interface Services

Who We Are

We are a technology services team focused on App interface integration and authorized API integration. We excel in protocol analysis, third-party interface connections, Open Data integration, and automated data scripting. We provide Android/iOS platform standardized interfaces, complete documentation and testing plans, ensuring deliverables are production-ready.

Compliance Notice: All work is based on client authorization or public/licensed APIs (Open Data / official interfaces) and complies with local laws and privacy protections. Where a protocol cannot be publicly accessed, we employ secure reverse engineering and data extraction methods, conducting technical analysis only within authorized scope.

Core Capabilities

• Accounts & Authentication modules (OAuth2, JWT, MFA, certificate-based TLS mutual authentication)
• Trading & positions interfaces (order placement, cancellation, order status callbacks, settlement records)
• Top-up / commissions system (top-up callbacks, commissions rules engine, reconciliation and exception handling)
• Real-time quotes & push (WebSocket / Server-Sent Events, incremental snapshots, reconnect strategies)
• Documentation & delivery: OpenAPI/Swagger, Postman collections, sample code (Node.js / Python / Java)
• Security & Compliance: data encryption, GDPR / regional compliance guidance, NDA support

Implementation Highlights for Target Apps

The following are interface implementation highlights and delivery plans designed around the target apps you provided. Each item includes authentication schemes, key APIs, error handling, and testing considerations.

• Greshma Connect: Focused on account linking and aggregation services. Implement unified identity (OAuth2 + JWT), multi-channel data synchronization interfaces (REST + Webhook), support batch import/export CSV, scheduled reconciliation tasks and retry strategies. Deliverables include connector templates, health-check API, and data consistency report scripts.
• PePlus Recharge Commission App: Top-up and commissions are core. Implement top-up callback receiver, idempotent token to prevent duplicates, commissions rules engine (percent / tiered / fixed), batch settlements and commission ledger export. Provide reconciliation API, manual review entry for exceptions, and event-based notifications (Email/SMS/Webhook).
• mStock: Demat & Stock Trading： Focus on securities trading and holdings management. Implement market data subscription (WebSocket), order placement (limit / market / stop), trade confirmations and settlement notifications, holdings and cash queries, tax reporting export. Support T+N settlement configuration, IPO subscription flow API, and KYC document upload API (chunked upload + hash verification).
• Fold: Crypto rewards & payments scenario. Implement crypto wallet address management API, BTC/Stablecoin on-ramp callbacks, on-chain/off-chain confirmation strategies, cashback/reward calculation module, and merchant payment integration. Provide secure signing schemes (HMAC or ECDSA), auditable order logs and compliance recommendations (AML / transaction monitoring).
• VPS IFA: Independent financial advisor platform integration. Implement client profiles & proposals interfaces, asset allocation templates, portfolio performance backtesting API, advisor permissions and electronic signature authorization, recommendations and tracking. Deliver advisor-API and CRM synchronization scripts, support bulk account import and automated reporting.
• Kron - Investering for alle [com.kronmobilapp]: Investment products for the general public. Implement fund/ETF/stock subscription interfaces, SIP management, automatic debit and trading calendar, returns statistics and goal-tracking dashboards. Support localization (Danish) error codes and local tax export formats, provide mobile-friendly low-latency interfaces and offline caching strategies.

Deliverables & Tech Stack

• Runnable sample code (Node.js / Python / Java), with deployment instructions and Dockerfile
• OpenAPI (Swagger) docs + Postman collections (including example requests and authentication flows)
• Automated test scripts (unit & integration tests) and recommended CI configurations
• WebSocket/REST dual-mode market data access samples and reconnect strategies
• Reconciliation & settlement automation with report export scripts (CSV/Excel/PDF)
• Security architecture documentation: TLS configuration, key management, signature strategies, and compliance guidance

Project Timeline & Estimates

1. Requirements confirmation & authorization documents (1-2 days)
2. Protocol analysis & design (2-4 days)
3. Development & unit testing (5-10 days)
4. Integration testing & documentation (2-4 days)
5. Delivery & training (1-2 days)

The above outlines a typical project cadence; actual timelines depend on third-party interface complexity and the speed of client authorization.

Pricing & Service Guarantees

• Starting price: $300 (basic protocol analysis & sample deliverables); complex projects will be quoted based on requirements
• Support a result-first delivery and pay-on-satisfaction model (subject to contract)
• Sign an NDA and conduct reverse engineering or data analysis only within the scope of client authorization

FAQ

What information do you need to start?

Please provide the target App name, the functionality points to implement, any APIs or test accounts you can authorize (if any), and any compliance/regional restrictions.

Can the delivered interfaces be used directly on mobile?

Yes. The delivered API source code, Postman collections, and sample clients can be directly integrated with Android/iOS backends, with deployment and testing guides included.

How do you ensure compliance and privacy?

We work only with client authorization or publicly available/licensed APIs. We provide data minimization, encrypted transmission, and localized compliance guidance when needed.

Contact Us

For inquiries, quotations, or to submit your target app name and requirements, please click the button below to access our contact page:

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Service Tags

App API integration | API integration | Top-up commissions | Securities trading interfaces | Crypto wallet integration | Advisory platform integration | OpenAPI documentation | Automated reconciliation | Compliance implementation