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Programming & Development Apps & Mobile

Mobile and Web Application Development

$12/hr Starting at $100

Project Overview

Zepto Digital Labs developed the Payment Checkout SDK, a powerful cross-platform library enabling businesses to embed our client's unified checkout experience within their mobile or web applications. The SDK supports real-time, secure payment processing with smart gateway routing and seamless fallback across payment providers.

Key SDK Variants

Flutter SDK

  • Built using flutter_inappwebview

  • Supports bidirectional communication (JavaScript ↔ Flutter)

  • Manages customer data, environments, and transaction lifecycle

  • GitHub sample app available


 Native Android SDK

  • Developed in Kotlin (Java-compatible)

  • Secure WebView for checkout embedding

  • Handles URLs, intents, and session tokens

  • GitHub sample app available


Native iOS SDK

  • Written in Swift with Objective-C compatibility

  • Uses WKWebView for secure checkout

  • Delegate-based callbacks for completion and error tracking


Security Practices Implemented

  • All communications via HTTPS

  • No exposure of client_secret or sensitive keys on the client side

  • Server-side validation of payment responses

  • Sandbox mode support for development and QA testing


Supported Use Cases

  • E-commerce checkout flows

  • QR code / deep link payments

  • One-time & recurring billing

  • Smart fallback between gateways

  • Consistent user experience across platforms


Outcome

The SDK significantly simplifies mobile payment integration for merchants and app developers, enhancing reliability, security, and conversion rates across diverse transaction types and platforms.

Looking for a custom payment SDK, checkout solution, or secure API integration?

We specialize in cross-platform SDK development, mobile wallets, and custom fintech tools.

Mail your payment or Fintech requirements.

About

$12/hr Ongoing

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Project Overview

Zepto Digital Labs developed the Payment Checkout SDK, a powerful cross-platform library enabling businesses to embed our client's unified checkout experience within their mobile or web applications. The SDK supports real-time, secure payment processing with smart gateway routing and seamless fallback across payment providers.

Key SDK Variants

Flutter SDK

  • Built using flutter_inappwebview

  • Supports bidirectional communication (JavaScript ↔ Flutter)

  • Manages customer data, environments, and transaction lifecycle

  • GitHub sample app available


 Native Android SDK

  • Developed in Kotlin (Java-compatible)

  • Secure WebView for checkout embedding

  • Handles URLs, intents, and session tokens

  • GitHub sample app available


Native iOS SDK

  • Written in Swift with Objective-C compatibility

  • Uses WKWebView for secure checkout

  • Delegate-based callbacks for completion and error tracking


Security Practices Implemented

  • All communications via HTTPS

  • No exposure of client_secret or sensitive keys on the client side

  • Server-side validation of payment responses

  • Sandbox mode support for development and QA testing


Supported Use Cases

  • E-commerce checkout flows

  • QR code / deep link payments

  • One-time & recurring billing

  • Smart fallback between gateways

  • Consistent user experience across platforms


Outcome

The SDK significantly simplifies mobile payment integration for merchants and app developers, enhancing reliability, security, and conversion rates across diverse transaction types and platforms.

Looking for a custom payment SDK, checkout solution, or secure API integration?

We specialize in cross-platform SDK development, mobile wallets, and custom fintech tools.

Mail your payment or Fintech requirements.

Skills & Expertise

Android DevelopmentApp & Mobile ProgrammingApp DevelopmentMobile DevelopmentObjective-CSoftware Development

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