How to create a custom payment widget for your FlutterFlow app?

Creating a Custom Payment Widget for Your FlutterFlow App

Creating a custom payment widget for your FlutterFlow app allows users to make payments directly from the application. The primary steps are as follows:

Step 1: Install Flutter and Dart in your IDE

To start creating a FlutterFlow app, ensure that you've installed Flutter and Dart in your IDE (Integrated Development Environment). If you're using Visual Studio Code, you can achieve this by going to the Extensions view (Ctrl+Shift+X) and type 'Flutter' and 'Dart' in the search box. Click on install for each extension.

Step 2: Initialize Your Flutter Project

Now, you're ready to initialize your FlutterFlow project. To do this, open up your Terminal in your IDE and navigate to the directory you want your project to be placed in. Then, run the following command:

flutter create my_payment_widget

This will create a project folder called "my_payment_widget". Navigate inside your newly created project folder with:

cd my_payment_widget

Step 3: Add Stripe Payment to your Flutter Project

To create a payment widget, you'll use Stripe which is a payment processing service. First, add the Stripe payment package to your project by editing your pubspec.yaml file. Find the dependencies section and add the code below:

```dependencies:
stripe_payment: ^1.0.7```

After adding the Stripe payment dependency, go back to the terminal and type:

flutter pub get

This will install the Stripe package to your Flutter project.

Step 4: Import the Stripe Payment Package

After installing the Stripe payment package, you should import it to your Flutter project. At the top of your main.dart file, add the Stripe payment import statement:

import 'package:stripe_payment/stripe_payment.dart';

Step 5: Initialize Stripe

The next step in creating a custom payment widget is to initialize Stripe. This is done by adding the following code to your main.dart file:

```void main() {
StripePayment.setOptions(
StripeOptions(
publishableKey: "your-publishable-key",
merchantId: "Test",
androidPayMode: 'test',
));
runApp(MyApp());
}```
The publishableKey can be acquired from your Stripe account dashboard.

Step 6: Build the UI for the Payment Widget

You'll need to create the UI for your custom payment widget. Add a RaisedButton in the build method:

```child: RaisedButton(
child: Text("Pay with Card"),
onPressed: payWithCard,
),```

Step 7: Implement the Payment Function

The final step is to implement the payment function. Create a new method called payWithCard:

```void payWithCard() async {
var paymentMethod = await StripePayment.paymentRequestWithCardForm(
CardFormPaymentRequest(),);
var paymentIntent = await StripeService.createPayment(paymentAmount: '150');
var response = await StripeService.confirmPayment(paymentIntent, paymentMethod['id']);
if (response.success){
showDialog(
context: context,
builder: (BuildContext context) => AlertDialog(
title: Text("Success"),
content: Text("Payment made successfully"),
),
);
}
}```

This method opens a Stripe's built-in card form, user can insert their card details and make a payment.

That's it! Now you have successfully created a custom payment widget for your FlutterFlow app.