About PayPal Payment

Integrating PayPal as a payment method in a Flutter app allows users to make secure payments directly through PayPal's platform, which can be particularly beneficial for global transactions. While PayPal doesn't offer a direct SDK for Flutter, you can still implement PayPal payment functionality using various workarounds, such as calling the PayPal API through a backend or using web-based solutions.

[In this article, we will use a web-based solution by using only a package]

Steps to Integrate PayPal

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[1] Add Flutter PayPal Package

</aside>

// In VS Code Termianl Write 
flutter pub add flutter_paypal_payment

• or there an extensions called Pubspec Assist
• or more easiest way select Dart: Add Dependency.

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[2] About Package [Too Easy Way to Use] & Create PayPal Model

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PaypalCheckoutView(
	sandboxMode: true,
	>> clientId: "YOUR_CLIENT_ID", // We will know how to Get this next step
	>> secretKey: "YOUR_SECRET_KEY",// We will know how to Get this next step
		transactions: const [
				// Define your transaction details here
		    // Order Detalis & Pricing
		],
		onSuccess: (Map params) async {
		    // Handle successful payment
		    // Show snack bar for example 
		},
		onError: (error) {
		    // Handle payment error
		    // Show snack bar for example 
		},
		onCancel: () {
		    // Handle payment cancellationImplement the onSuccess, onError, and onCancel callbacks to handle the respective payment outcomes.
		    // Show snack bar for example 
		},
);

See the example in the flutter_paypal_payment package to create a PayPal model using the Dart to JSON extension.

• How to Use the Dart to JSON Extension

{
  "amount": /*Copy From Here >>*/ {
  "total": "100",
  "currency": "USD",
  "details": {
	  "subtotal": "100",
	  "shipping": "0",
	  "shipping_discount": 0
  }
} // << To Here Model Usig Extension

// >> The total and subtotal **must be equal**

"item_list": /*Copy From Here >>*/ {
	"items": [
		{
		"name": "Apple",
		"quantity": 4,
		"price": "10",
		"currency": "USD"
		}, // 40$
		{
		"name": "Pineapple",
		"quantity": 5,
		"price": "12",
		"currency": "USD"
		} // 60$ 
	]
} // << To Here Model Usig Extension

Now that we've covered the basic setup and usage of the PayPal package in Flutter, let's move on to the next crucial step: obtaining your PayPal client ID and secret key. These credentials are essential for authenticating your app with PayPal's services and enabling secure transactions. In the following section, we'll walk through the process of creating a PayPal Developer account and retrieving these important credentials.