Overseas App API Integration & API Services | Accounting, Financial, Banking and Crypto Wallet Solutions

Who We Are

We are a tech team specializing in App interface integration and authorization API integration, with years of experience in mobile apps and fintech. We provide end-to-end delivery from protocol analysis and interface refactoring to Open Data integration and third-party service connections, plus automation scripts and comprehensive documentation.

Compliance Note: All work is conducted only under client authorization or based on public/authorized APIs, strictly adhering to local laws and privacy protections. NDA can be signed upon request.

Core Capabilities & Deliverables Standards

Platform support: Android / iOS client interface simulation, backend API adaptation and middleware implementation
Security & Authentication: OAuth2, JWT, TLS, two-factor authentication and encrypted field handling
Compliance-first: Only project work based on authorized agreements or public data; uses compliant reverse engineering/data extraction where allowed
Deliverables: runnable sample code (Node.js / Python / Java), Postman collections, OpenAPI/Swagger documentation, automated test scripts

Target App Functionality Implementation Examples

The following are suggested interface implementations and delivery contents for each target app name you provided (all based on lawful authorization or public data). Each item includes API specifications, example code, and test suites:

SpendSpentSpent:
A personal / small business expense tracking and budgeting app. We can implement: user authentication (social + email), local/cloud invoice syncing, receipt OCR upload and parsing, category rules engine, periodic report API, export (CSV/XLS) and multi-currency support. Includes automated reconciliation scripts and a sample database schema.
Bimasraf - Muhasebe Yönetimi:
A Turkish-language accounting management system. Implementations include: invoice/expense entry API, chart of accounts mapping, VAT handling, voucher generation/export, supplier and customer reconciliation interfaces, bulk import/export (Excel/CSV), and compliant data field mappings aligned with local tax requirements.
AnyDay Financial:
A financial product aggregator and personal finance platform. Supports account aggregation API (Open Banking / PSD2 style), real-time balance and transaction sync, smart budgeting/forecasting API, read-only integration for third-party investment accounts, webhook-based notifications/reminders, and quick mobile authorization examples (OAuth2 PKCE).
Anorbank:
Bank-grade online services interface. Includes account authentication flow, standardized billings and transactions query, real-time transfers / interbank payments (with limits and risk controls), reconciliation callbacks, logs and audit fields guidelines, plus sandbox testing scripts and compliance checklists.
Tonhub — TON wallet[com.tonhub.wallet]:
Crypto wallet (TON ecosystem). Deliverables include: wallet connection/signing interfaces (WalletConnect or custom solution), address and balance queries, transaction construction and signing examples, token/contract interaction templates, speed and fee estimation APIs, plus cold signature / key management guidance. Deliverables include security notes and third-party node integration docs.
Pulgir - Currency Converter:
Exchange rate and currency conversion tool. Deliverables include: real-time rate aggregator (multi-source failover), historical rate queries, conversion API (with decimal precision control), threshold-change webhooks, offline rate caching strategies, and multi-region time zone handling for global multi-currency scenarios.

Typical Deliverables

runnable API samples (Node.js / Python / Java) with integration scripts and documentation
Postman / Insomnia interface collections with authentication headers
OpenAPI / Swagger documentation and field definitions (including error codes & sample responses)
Automated tests, performance baselines, and security audit recommendations

Service Process & Pricing

Process: requirements confirmation → authorization & compliance review → protocol analysis → API implementation → testing & delivery
Pricing: starting at $300; flexible model including demos/prototypes before acceptance; final price assessed by scope and compliance requirements
Guarantee: work only under client authorization or based on public/authorized APIs; NDA and compliance guidance provided

FAQ

What information do I need to provide?

Just provide the target app name and clear requirements (for example: transaction sync, exchange rate aggregation, wallet signing). If you have authorization credentials or developer docs, please share them to speed up delivery.

How long does it take?

Simple interfaces (single feature) typically take 3-7 business days; complex integrations (bank/wallet/multi-party authentication) typically 7-20 business days, depending on compliance and authorization processes.

Is deployment and maintenance supported after delivery?

We offer deployment scripts, operational guidance, and CI solutions on demand, and can sign ongoing maintenance contracts.

Contact Us

For detailed proposals or quotes for any of the applications above, please click the button below to view contact details and submit your target app name and requirements:

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