WordPress Custom Plugin Development Expert

WordPress Custom Plugin Developer

Payment Gateways • Product Automation • API Integration

Expert WordPress custom plugin development following WordPress strict coding standards and security protocols. Specializing in payment gateway plugins, product automation, and seamless data exchange between WordPress and third-party REST APIs including .NET platforms.

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WordPress Custom Plugin Development Services

From payment gateways to complex automation systems—I build production-ready WordPress plugins that follow strict coding standards

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Payment Gateway Plugins

Custom WooCommerce payment gateway plugins that integrate seamlessly with global payment processors. Built with PCI DSS compliance, secure tokenization, and hardened webhook processing.

✓ WooCommerce payment gateway integration
✓ PCI DSS Level 1 compliant
✓ Multi-currency support
✓ Recurring payment subscriptions
✓ Fraud detection & prevention
✓ Real-time transaction processing

Technologies: PHP, WooCommerce API, REST API, OAuth 2.0

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Product Automation Plugins

Intelligent product management plugins that automate inventory sync, pricing updates, stock management, and multi-warehouse coordination. Reduce manual work by 90%.

✓ Automated inventory synchronization
✓ Dynamic pricing rules engine
✓ Multi-warehouse stock management
✓ Bulk product import/export
✓ Automated product categorization
✓ Real-time stock level locking

Technologies: WordPress Hooks, WooCommerce API, Background Processing

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REST API Integration Plugins

Seamless data exchange between WordPress and third-party platforms including .NET applications, CRMs, ERPs, and custom APIs. Built with idempotent processing and error resilience.

✓ WordPress REST API integration
✓ .NET platform connectivity
✓ Bi-directional data sync
✓ Webhook endpoint hardening
✓ Schema validation & sanitization
✓ Error recovery mechanisms

Technologies: REST API, JSON, OAuth 2.0, Webhooks, cURL

Why Choose Me for WordPress Custom Plugin Development?

WordPress Strict Standards

Every plugin follows WordPress Coding Standards, PHP best practices, and security guidelines. Your plugin will pass WordPress.org review, work with all themes, and remain compatible through WordPress updates.

✓ WordPress Coding Standards compliant
✓ PHP 7.4+ compatibility
✓ WordPress.org plugin review ready
✓ Multisite compatible
✓ Translation-ready (i18n)

Security First Approach

Security is built-in from day one. Data sanitization, nonce verification, capability checks, SQL injection prevention, and XSS protection are standard in every plugin I develop.

✓ Data sanitization & validation
✓ Nonce verification for forms
✓ Capability checks for user roles
✓ Prepared SQL statements
✓ XSS & CSRF protection

Production-Grade Code

Not prototypes—production-ready plugins. Error handling, logging, debugging modes, and comprehensive testing ensure your plugin works flawlessly in real-world scenarios.

✓ Comprehensive error handling
✓ Debug logging system
✓ Unit testing & integration testing
✓ Performance optimization
✓ Memory leak prevention

API Integration Expertise

Deep expertise in connecting WordPress with external systems. Whether it's .NET applications, CRMs, payment processors, or custom APIs—I build reliable, hardened integrations.

✓ REST API integration
✓ OAuth 2.0 authentication
✓ Webhook processing
✓ Rate limiting & throttling
✓ Idempotent operations

Technical Capabilities

WordPress Plugin Development

Core WordPress APIs

• WordPress Hooks (Actions & Filters)
• WordPress REST API
• Custom Post Types & Taxonomies
• Settings API & Options API
• Transients API for caching
• Cron API for scheduled tasks

WooCommerce Integration

• Custom Payment Gateways
• Shipping Method Extensions
• Product Type Extensions
• Order Status Management
• Cart & Checkout Customization
• Subscription Integration

Third-Party API Integration

Platform Integration

• .NET Application Integration
• CRM Systems (Zoho, HubSpot, Salesforce)
• ERP Platforms
• Payment Processors
• Inventory Management Systems
• Shipping & Logistics APIs

Integration Patterns

• RESTful API Communication
• OAuth 2.0 Authentication
• Webhook Endpoint Processing
• GraphQL Integration
• SOAP API Support
• Real-time Data Synchronization

WordPress Plugin Development Process

1

Requirements Analysis

Deep consultation to understand your business needs, technical requirements, and integration points. I analyze your existing WordPress setup, identify dependencies, and create a detailed technical specification following WordPress plugin architecture best practices.

2

Architecture & Design

Design plugin architecture following WordPress object-oriented patterns, namespace conventions, and autoloading standards. Plan database schema, custom tables (if needed), and API integration layers. Ensure scalability and maintainability.

3

Development with Standards

Write clean, documented code following WordPress Coding Standards. Implement security best practices, data sanitization, nonce verification, and capability checks. Build admin interfaces using WordPress Settings API. Create REST API endpoints if needed.

4

Testing & Security Audit

Comprehensive testing across WordPress versions, PHP versions, and popular themes. Security audit for vulnerabilities, performance testing, and compatibility checks. Test with WordPress debug mode enabled to catch any PHP notices or warnings.

5

Documentation & Deployment

Provide comprehensive documentation including installation guide, configuration instructions, API documentation (if applicable), and developer notes. Deploy to your staging environment for final testing, then production deployment with zero downtime.

Common WordPress Custom Plugin Use Cases

Custom Payment Gateway Plugin

Need to integrate a payment processor that doesn't have a WooCommerce plugin? I'll build a custom payment gateway plugin that handles authentication, transaction processing, webhooks, and refunds—all following WooCommerce payment gateway standards.

Product Automation Plugin

Automate product imports from external systems, sync inventory across multiple warehouses, update pricing based on external APIs, or automate product categorization. Reduce manual work by 90% with intelligent automation.

WordPress to .NET Data Sync

Sync WordPress data (users, posts, orders) with your .NET application in real-time. Bi-directional synchronization with conflict resolution, data transformation, and secure authentication between platforms.

CRM Integration Plugin

Connect WordPress forms, WooCommerce orders, or user registrations to your CRM (Zoho, HubSpot, Salesforce). Automatically create leads, sync customer data, and update records in real-time.

Custom Admin Dashboard

Build custom admin pages, widgets, and dashboards that display data from external APIs, generate reports, or provide specialized functionality for your business needs.

Webhook Processing Plugin

Receive and process webhooks from third-party services securely. Includes signature verification, idempotent processing, error handling, and automatic retry mechanisms for reliable data processing.

Code Quality & Standards

WordPress Standards Compliance

✓ WordPress Coding Standards: All code follows WPCS (WordPress Coding Standards) with proper indentation, spacing, and naming conventions
✓ PHP Standards: PSR-12 compatible code structure with proper namespacing and autoloading
✓ Security Standards: All inputs sanitized, outputs escaped, nonces verified, capabilities checked
✓ Database Standards: Using $wpdb for all database operations, prepared statements, proper escaping
✓ Internationalization: All strings translatable using __(), _e(), _n() functions with text domains

Security Protocols

✓ Data Sanitization: sanitize_text_field(), sanitize_email(), wp_kses() for all user inputs
✓ Output Escaping: esc_html(), esc_attr(), esc_url(), wp_kses_post() for all outputs
✓ Nonce Verification: wp_nonce_field() and wp_verify_nonce() for all forms
✓ Capability Checks: current_user_can() before any privileged operations
✓ SQL Injection Prevention: $wpdb->prepare() for all database queries
✓ XSS Protection: Proper escaping and sanitization to prevent cross-site scripting

WordPress Plugin Development Portfolio

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15+ Payment Gateway Plugins

Custom WooCommerce payment plugins for Zai, Network International, shurjoPay, Payex/Xendit, Checkbook.io, PayDollar, and more. All PCI DSS compliant and production-ready.

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Product Automation Systems

Built multi-warehouse inventory sync, automated pricing engines, and real-time stock management plugins handling 50k+ products across multiple brands.

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200+ API Integrations

Connected WordPress with CRMs, ERPs, payment processors, logistics platforms, and custom .NET applications. All with hardened webhooks and error resilience.

Frequently Asked Questions

How long does it take to develop a custom WordPress plugin?

Simple plugins (single functionality, basic features) typically take 1-2 weeks. Medium complexity plugins (payment gateways, API integrations) take 2-4 weeks. Complex plugins (multi-feature, extensive API integration, automation systems) can take 4-8 weeks. I provide a detailed timeline during the discovery phase.

Do you follow WordPress Coding Standards?

Absolutely. All plugins follow WordPress Coding Standards (WPCS), PHP best practices, and WordPress security guidelines. Code is reviewed for standards compliance, properly namespaced, and ready for WordPress.org submission if needed. I use PHP_CodeSniffer with WordPress rules to ensure compliance.

Can you integrate WordPress with .NET applications?

Yes. I've built numerous integrations between WordPress and .NET platforms using REST APIs, SOAP services, or custom protocols. The plugin handles authentication, data transformation, bi-directional sync, and error handling. Your .NET application can read/write WordPress data seamlessly.

Will my plugin work with all WordPress themes?

Yes. Plugins are developed to be theme-agnostic. I use WordPress APIs and hooks rather than theme-specific code. The plugin will work with any WordPress theme that follows WordPress standards. I test with default themes (Twenty Twenty-Four, etc.) and popular themes to ensure compatibility.

Do you provide plugin documentation?

Yes. Every plugin includes comprehensive documentation: installation guide, configuration instructions, user manual, developer documentation (if applicable), API documentation (for integrations), and inline code comments. You'll have everything needed to maintain and extend the plugin.

What if I need updates or modifications after delivery?

I offer ongoing support and maintenance packages. You can request bug fixes, feature additions, WordPress compatibility updates, or modifications. I also provide code ownership, so you can hire other developers if needed, though I recommend staying with me for consistency and expertise.

Ready to Build Your Custom WordPress Plugin?

Let's discuss your WordPress plugin development needs. I'll provide a detailed proposal with timeline and pricing.