Overseas App API Integration & Interface Services | Loans, Wallets, Banks & EMI Calculators

About Us

We are a technical team specialized in app interface integration and authorized API connectivity, with years of experience in mobile and fintech projects. Based on client authorization or publicly available data (Open Data), we provide protocol analysis, interface refactoring, integration of third-party and bank interfaces, automated scripts, and comprehensive documentation delivery, supporting Android and iOS platforms.

Compliance Guarantee: All work is performed under client authorization or public/licensed APIs, complying with local laws and privacy protections. We avoid risky terminology and describe activities as 'reverse engineering/data extraction (within authorized scope)' to ensure professional compliance.

Core Capabilities

Standardization of financial interfaces: login, account/balance queries, transactions, billing export and reconciliation
Payments & wallet integration: QR payments, payment gateway integration, top-up & withdrawal, points and vouchers synchronization
Loans & credit workflows: loan applications, interest rate calculations, EMI plan generation, repayment calendar & overdue management
Authentication & security: OAuth2, JWT, TLS, device binding, sensitive data masking and compliant logging
Deliverables: runnable source code (Node.js/Python/Java), Postman collections, OpenAPI/Swagger docs, test cases

Functionality Examples & Requirements for Your Target Apps

Below are functional abstractions and deliverable implementations for each target app, tailored by product features for API specs, authentication flows, and sample code.

VayPay - Vay Easy: Positioned as a fast loan/installment app. Key implementation points:
- Loan application API (submit documents, identity verification, credit limit assessment) and asynchronous approval callback interface;
- Interest rate & EMI calculation module: supports multi-term EMI plans, early repayment calculations, repayment calendar API;
- Transaction history & billing export (CSV/PDF) and bill push/notification integration;
- Compliance & risk integration: blacklist/whitelist checks, credit scoring API integration, audit logging.
Precificação by Luh Ribeiro: Positioned as pricing/quoting/merchant tools app. Key implementation points:
- Product pricing calculation API and bulk import interfaces (support regional tax rates, promotions, and bundling rules);
- Pricing simulator: REST API to generate quotes for different scenarios (currency conversion and surcharge calculations);
- Access control & role management: multi-level permissions for merchants/branches/admins with operation logs;
- Data synchronization: Webhooks and scheduled scripts with e-commerce platforms or inventory systems.
bimbank Mobile: Typical banking client interface implementation. Key points:
- Secure login & session management (multi-factor authentication, device fingerprinting, OAuth2 + PKCE);
- Account & sub-account queries, real-time balance, transaction details and reconciliation export interfaces;
- Internal transfers, interbank transfers, and batch payment interfaces (support bank-specific message formats);
- Connect to core banking systems (e.g., ISO20022 or custom protocols) and provide mock services for frontend integration.
Easy EMI - EMI Loan Calculator: Loan/EMI calculator app. Key points:
- EMI calculation API with frontend/backend separation, supporting equal installments and equal principal with custom terms;
- Scenario simulator: prepayment, penalty interest simulation, installment fee breakdown;
- Export schedule (Excel/PDF), embedded SDK examples, and mobile performance optimization suggestions;
- Extensible pricing engine to accommodate different loan products or rate tables.
LendingTree Spring[com.ltmoneycenter_android.PROD]: Package-name based lending platform product. Key points:
- Package-name/channel-level configuration management: supports different environments (Prod/Stage) and channel-specific feature flags;
- Loan product catalog, application flow and approval chain API standardization;
- Analytics interfaces: daily active users, loan conversion rate, default rate, with event tracking and export;
- In-app notifications, message center, and integration with user support ticket systems.
Peppy Gold: Possibly a premium membership or paid service app. Key points:
- Membership subscriptions & payments APIs (support third-party gateways, in-app purchases, and local payments);
- Privileges/quota management APIs (validity, tier upgrades, expiration reminders);
- Transaction & invoicing management (invoicing, refunds, and receipt downloads);
- Security requirements: encrypted storage of sensitive information, access controls, and compliant logging retention policies.

Deliverables & Tech Stack

runnable sample code (Node.js / Python / Java) and integration scripts, with CI configuration references.
Postman collections and environment configurations, sample requests and header/auth guidance.
Standardized API documentation (OpenAPI/Swagger) and mock services to facilitate frontend parallel development.
Automated test cases and performance baseline recommendations (including load testing scripts).
Deployment guidance and security hardening (TLS configurations, WAF suggestions, key management strategies).

Pricing & Service Process

Starting at $300 (pricing based on complexity), with a flexible model offering sample delivery first and payment upon confirmation;
Service flow: requirements confirmation → contract & authorization confirmation → prototype & API design → development & implementation → testing & integration → documentation delivery;
NDA can be signed, and within client authorization scope we conduct "reverse engineering/data extraction"-type analysis to achieve compatibility.

FAQ

What information do I need to provide?

Please provide the target app name, functional requirements, whether you have API documentation or authorization credentials (for third-party/bank integrations), and the desired delivery timeline and environment (Prod/Stage).

Do you support multi-language and localization?

Yes. API design and documentation can be provided in multiple languages (English/Chinese/local language), and localization for currency, time zone, and tax rules can be configured.

What is the typical delivery timeline?

Timing depends on complexity: standard API integration and documentation delivery typically 5-10 business days; complex banking/core system integrations require assessment before a timeline is provided.

Contact Us

For inquiries, quotes, or to submit target App name and requirements, please click the button below to access the contact page:

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