Payment Gateway Integration: Stripe, PayPal, Nexi

Payment gateway integration is the point where an e-commerce or a platform turns an order into a real payment: if the checkout is slow, insecure or disconnected from the rest of the systems, the result is abandoned carts, declined payments and accounting reconciliation done by hand. That is why we integrate the main gateways — Stripe, PayPal, Nexi, Adyen and others — directly into your custom e-commerce, apps and management systems, choosing the right provider and integration model for user experience, fees and security.

Every integration is built on tailored APIs and reliable webhooks, so that orders, payments and payment states stay synchronized in real time with your management system. We handle recurring payments and subscriptions, refunds and automatic reconciliation, and we guarantee PSD2 compliance with strong authentication (SCA) and card tokenization to reduce the PCI DSS scope. The service builds on our work in custom web API development and integrates with custom ERP and management software to connect payments to billing, inventory and accounting.

gateways

Stripe, PayPal, Nexi and Adyen

We are not tied to a single vendor: together we choose the payment gateway best suited to your business, weighing fees, supported methods (cards, wallets such as Apple Pay and Google Pay, bank transfers, SEPA direct debits), geographic coverage and technical requirements. We integrate Stripe, PayPal, Nexi and Nexi XPay, Adyen and, where needed, specific banking circuits, using hosted checkout, embedded elements or direct APIs. The goal is a smooth and reliable payment experience, optimized to reduce abandoned carts without compromising security.

recurring

Recurring payments and subscriptions

For subscription and pay-per-use models we implement recurring payments with automatic handling of the entire lifecycle: renewals, trial periods, plan upgrades and downgrades, suspensions and retry logic when a payment fails. We connect the subscription status to the ERP or CRM system and to billing, so that customer, payments and accounting documents always stay aligned. This way the company gains predictable revenue and lean operations, without manually managing deadlines, unpaid invoices and renewals.

security

PSD2, SCA and reliable webhooks

Security and reliability are at the heart of every integration. We build PSD2-compliant flows with strong customer authentication (SCA) and 3-D Secure, and we use card tokenization to never process sensitive data in the clear, reducing the PCI DSS compliance scope. On the technical side we build integrations based on idempotent webhooks with retries, which update orders, payments and refunds in real time even in case of network errors. Automatic reconciliation aligns transactions, orders and accounting, reducing errors and manual work and giving full traceability to every movement.