Square Payment Integration Suite
Square payment integration for WordPress with drag-and-drop forms, digital wallets, and subscription management.
The Challenge
WordPress users needed a seamless way to accept payments without a full shopping cart—supporting one-time, recurring, donations, and subscriptions with modern payment methods like Apple Pay, Google Pay, and ACH.
The Architecture
Built a comprehensive Square integration with drag-and-drop multi-step form builder, modal/pop-up layouts, digital wallet support (Apple Pay, Google Pay, Cash App, Afterpay), subscription pause/resume functionality, and Square POS sync. Implemented OAuth sandbox testing and Google reCAPTCHA for security.
The Impact
Deployed on 2,000+ WordPress sites; enabled 5 payment methods across US, Canada, Australia, Japan, and UK; achieved 3.8/5 rating with users praising ease of use and responsive support.
Technology Stack
Code Level Analysis
- React-based drag-and-drop form builder with live preview
- OAuth 2.0 flow with PKCE for Square API authentication
- Web Payments API integration for Apple Pay / Google Pay
- Subscription state machine with pause/resume/cancel handlers
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