FinTech API Integration Guide

Technical references for payment gateway integration, banking APIs, and open banking standards. Covers Stripe, Plaid, Adyen, PCI compliance, webhook patterns, and global payment method support.

Stripe Guide Open Banking Overview

API Integration Guides

Detailed integration references for major payment and banking API providers.

Stripe

Payments

Payment Intents, Subscriptions, Connect platform accounts, webhooks, idempotency keys, and SCA/3DS handling.

Plaid

Banking

Link flow, Transactions, Auth, Identity, Assets, Investments, Liabilities, Item lifecycle, and webhook handling.

Adyen

Payments

Drop-in vs API-only integration, payment methods, recurring payments, 3DS2, split payments, and risk management.

Developer Guides

Standards, compliance requirements, and implementation patterns for payment systems.

Open Banking

PSD2, UK Open Banking Standard, FDX (US), TPP roles (AISP/PISP/CBPII), consent management, and SCA requirements.

PCI DSS Compliance

SAQ types, tokenization strategies, PCI scope reduction, and processor responsibility matrices for developers.

Webhook Best Practices

Idempotency, HMAC signature verification, retry policies, event ordering, and dead letter queue patterns.

Quick References

Lookup tables for payment methods, error codes, and regional coverage.

Global Payment Methods

Cards, wallets, bank transfers, BNPL, and local payment methods by region with settlement times and fee ranges.

Error Codes Reference

Stripe error codes, Adyen result codes, HTTP status mapping, and retry-safe vs non-retry error classification.

Disclaimer: This site provides technical information about payment and banking API integrations. It does not constitute financial, legal, or compliance advice. API specifications and pricing are subject to change by their respective providers. Always refer to official provider documentation for the most current information.