Make every payment and API event reliable from checkout to fulfillment.

I help SaaS companies and growing businesses integrate payment providers and third-party APIs into their web applications. The focus is not only on making the first request work, but on building a reliable flow with secure webhooks, clear payment states, duplicate-event protection, failure handling, and maintainable backend logic.

I can help with:

Stripe, PayPal, Xendit, Midtrans, and other payment providers

One-time payments, subscriptions, invoices, and payment links

Checkout and payment confirmation flows

Webhook endpoints and signature verification

Payment status mapping and transaction lifecycle handling

Idempotency and duplicate event protection

Failed payments, retries, refunds, and cancellations

REST and JSON API integrations

OAuth, API authentication, and secure credential handling

Email, WhatsApp, and notification workflows

Admin dashboards for transactions and integration logs

Sandbox and production environment setup

What you can expect:

A clear integration plan based on your existing workflow

Secure and maintainable backend implementation

Proper webhook and transaction state handling

Validation for success, failure, pending, and edge-case scenarios

Testing and documentation for future maintenance

Deployment support and technical handover

Typical process:

Review your current application and integration requirements

Map the payment or API events to your business workflow

Implement the integration and backend logic

Test success, failure, retry, and duplicate-event scenarios

Deploy, document, and prepare the integration for ongoing use

I can work with an existing Laravel, PHP, Node.js, or React-based application, or help you design the integration for a new SaaS product.

Send me your current workflow, provider documentation, or existing codebase. I will help identify the right integration approach and the edge cases that need to be handled.