flutter_pay_buttons 0.0.2

A Flutter plugin to add Apple Pay support or Google Pay support via the pay package, with a custom widgets.

Flutter Pay Buttons Flutter Plugin

A Flutter plugin that adds Flutter Pay Buttons support using the pay package under the hood. This plugin provides a customizable Flutter Pay Buttons and simplifies the integration process.

Features

• Custom Apple Pay button with styling options
• Uses the reliable pay package for handling payment requests
• Easy to integrate in your existing Flutter app

Getting Started

Before you begin, ensure the following:

• You're developing on a macOS system (Apple Pay is only available on iOS/macOS).
• Your app has the necessary entitlements and configuration for Apple Pay.
• You’ve set up Apple or Google Merchant ID's and certificates in your Apple or Google Developer account.

Installation

Add the dependency in your pubspec.yaml:

dependencies:
  flutter_pay_buttons:
    git:
      url: https://github.com/M-Tayyab-Mustafa/flutter_pay_buttons

Payment Data Cryptography

Google Pay encrypts payment information before it leaves the user’s device using industry-standard public key cryptography. When your app receives the payment response, it contains:

• Encrypted Payment Data — Sensitive card/payment details
• Signature — For verifying data integrity
• Intermediate Signing Key — Used to validate the signature

How Google Pay Encryption Works

1. Device Encryption — Google Pay encrypts the payment data using your payment processor’s public key.
2. Data Transport — The encrypted blob is returned to your app through the Google Pay API.
3. Signature Verification — Your server verifies the signature using the intermediate signing key provided in the response.
4. Decryption — Your server decrypts the payment data using your private key.
5. Processing — The decrypted details are sent to your payment processor for authorization.

Important

• Never decrypt payment data in the client app.
• Always verify the signature before decryption.
• Keep private keys secure and only on your backend server.

📚 References:

• Google Pay Payment Data Cryptography Guide