Overview

Developing a WordPress payment gateway plugin means creating a secure bridge between your site and a payment processor, handling tokenization or direct charges, and updating order status reliably. It requires PHP knowledge, familiarity with WordPress hooks and filters, and attention to security and compliance.

Step-by-step approach

  1. Specify requirements: decide supported cards, currencies, recurring billing, refunds, and whether it will integrate with WooCommerce or a custom checkout.
  2. Create the plugin scaffold: register the plugin, admin settings page for API keys, and localization support.
  3. Implement API integration: write server-side code to authorize, capture, refund, and listen for webhooks using the processor’s sandbox environment.
  4. Build the checkout experience: add secure frontend forms, client-side tokenization where available, and graceful error handling so users don’t lose cart contents.
  5. Harden security: use nonces, sanitize and escape data, enforce TLS, and avoid storing raw card data unless you meet PCI requirements.
  6. Test thoroughly: run sandbox tests, simulate network failures and retries, validate webhooks, and perform unit/integration tests.

Launch and support

Plan for staging, a gradual rollout, and monitoring for chargebacks and failed webhooks. Typical development can range from one to several weeks depending on features. If you want expert help to speed delivery and ensure compliance, Thinkit Media can provide development, testing, and deployment support to reduce risk and save time.