Payment Module (Pro)

You must have an ABP Team or a higher license to use this module.

Payment module implements payment gateway integration of an application. It provides one time payment and recurring payment options.

See the module description page for an overview of the module features.

How to install

Payment module is not installed in the startup templates. So, it needs to be installed manually. There are two ways of installing a module into your application.

Using ABP CLI

ABP CLI allows adding a module to a solution using add-module command. You can check its documentation for more information. So, payment module can be added using the command below;

abp add-module Volo.Payment

Manual Installation

If you modified your solution structure, adding module using ABP CLI might not work for you. In such cases, payment module can be added to a solution manually.

In order to do that, add packages listed below to matching project on your solution. For example, Volo.Payment.Application package to your {ProjectName}.Application.csproj like below;

<PackageReference Include="Volo.Payment.Application" Version="x.x.x" />

After adding the package reference, open the module class of the project (eg: {ProjectName}ApplicationModule) and add the below code to the DependsOn attribute.

[DependsOn(
  //...
  typeof(AbpPaymentApplicationModule)
)]

If you are using Blazor Web App, you need to add the Volo.Payment.Admin.Blazor.WebAssembly package to the {ProjectName}.Blazor.Client.csproj project and ad the Volo.Payment.Admin.Blazor.Server package to the {ProjectName}.Blazor.csproj project.

Supported Gateway Packages

In order to use a Payment Gateway, you need to add related NuGet packages to your related project as explained in Manual Installation section above and add DependsOn to your related module. For example, if you don't want to use PayU, you don't have to use its NuGet packages.

After adding packages of a payment gateway to your application, you also need to configure global payment module options and options for the payment modules you have added. See the Options section below.

Creating a custom payment gateway

If you require a different payment gateway than existing ones, you can create a custom payment gateway by your own. 2 steps are required to create a custom payment gateway. First is creating a payment gateway object that implements IPaymentGateway. This interface exposes core payment operations without any UI. Second step is creating UI for the payment gateway. This UI is used to redirect user to payment gateway and validate payment.

Follow the instructions here to create a custom payment gateway.

Packages

This module follows the module development best practices guide and consists of several NuGet and NPM packages. See the guide if you want to understand the packages and relations between them.

You can visit Payment module package list page to see list of packages related with this module.

User interface

Public Pages

Payment gateway selection

This page allows selecting a payment gateway. If there is one payment gateway configured for final application, this page will be skipped.

payment-gateway-selection

PayU prepayment page

This page is used to send Name, Surname and Email Address of user to PayU.

payment-payu-prepayment-page

Admin Pages

Angular UI

Installation

In order to configure the application to use the PaymentModule, you first need to import PaymentAdminConfigModule from @volo/abp.ng.payment/admin/config to the root module. PaymentAdminConfigModule has a static forRoot method which you should call for a proper configuration:

// app.module.ts
import { PaymentAdminConfigModule } from '@volo/abp.ng.payment/admin/config';

@NgModule({
  imports: [
    // other imports
    PaymentAdminConfigModule.forRoot(),
    // other imports
  ],
  // ...
})
export class AppModule {}

The PaymentAdminModule should be imported and lazy-loaded in your routing module as below:

// app-routing.module.ts
const routes: Routes = [
  // other route definitions
  {
  path: 'payment',
  loadChildren: () =>
    import('@volo/abp.ng.payment/admin').then(m => m.PaymentAdminModule.forLazy()),
  },
];

@NgModule(/* AppRoutingModule metadata */)
export class AppRoutingModule {}

Payment plans page

Payment plans for subscriptions can be managed on this page. You can connect external subscriptions for each gateway to a plan.

payment plans

payment plans gateway plans

Payment request list

This page lists all the payment request operations in application.

payment request list

Options

PaymentOptions

PaymentOptions is used to store list of payment gateways. You don't have to configure this manually for existing payment gateways. You can, however, add a new gateway like below;

Configure<PaymentOptions>(options =>
{
	options.Gateways.Add(
		new PaymentGatewayConfiguration(
			"MyPaymentGatewayName",
			new FixedLocalizableString("MyPaymentGatewayName"),
			typeof(MyPaymentGateway)
		)
	);
});

AbpIdentityAspNetCoreOptions properties:

  • PaymentGatewayConfigurationDictionary: List of gateway configuration.
    • Name: Name of payment gateway.
    • DisplayName: DisplayName of payment gateway.
    • PaymentGatewayType: type of payment gateway.
    • Order: Order of payment gateway.

PaymentWebOptions

PaymentWebOptions is used to configure web application related configurations.

  • CallbackUrl: Final callback URL for internal payment gateway modules to return. User will be redirected to this URL on your website.
  • RootUrl: Root URL of your website.
  • GatewaySelectionCheckoutButtonStyle: CSS style to add Checkout button on gateway selection page. This class can be used for tracking user activity via 3rd party tools like Google Tag Manager.
  • PaymentGatewayWebConfigurationDictionary: Used to store web related payment gateway configuration.
    • Name: Name of payment gateway.
    • PrePaymentUrl: URL of the page before redirecting user to payment gateway for payment.
    • PostPaymentUrl: URL of the page when user redirected back from payment gateway to your website. This page is used to validate the payment mostly.
    • Order: Order of payment gateway for gateway selection page.
    • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
    • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.

PayuOptions

PayuOptions is used to configure PayU payment gateway options.

  • Merchant: Merchant code for PayU account.
  • Signature: Signature of Merchant.
  • LanguageCode: Language of the order. This will be used for notification email that are sent to the client, if available.
  • CurrencyCode: Currency code of order (USD, EUR, etc...).
  • VatRate: Vat rate of order.
  • PriceType: Price type of order (GROSS or NET).
  • Shipping: A positive number indicating the price of shipping.
  • Installment: The number of installments. It can be an integer between 1 and 12.
  • TestOrder: Is the order a test order or not (true or false).
  • Debug: Writes detailed log on PAYU side.

PayuWebOptions

PayuWebOptions is used to configure PayU payment gateway web options.

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.
  • PrePaymentCheckoutButtonStyle: Css style to add Checkout button on PayU prepayment page. This class can be used for tracking user activity via 3rd party tools like Google Tag Manager.

TwoCheckoutOptions

TwoCheckoutOptions is used to configure TwoCheckout payment gateway options.

  • Signature: Signature of Merchant's 2Checkout account.
  • CheckoutUrl: 2Checkout checkout URL (it must be set to https://secure.2checkout.com/order/checkout.php).
  • LanguageCode: Language of the order. This will be used for notification email that are sent to the client, if available.
  • CurrencyCode: Currency code of order (USD, EUR, etc...).

TwoCheckoutWebOptions

TwoCheckoutWebOptions is used to configure TwoCheckout payment gateway web options.

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.

StripeOptions

StripeOptions: is used to configure Stripe payment gateway options.

  • PublishableKey: Publishable Key for Stripe account.
  • SecretKey: Secret Key for Stripe account.
  • WebhookSecret: Used for handling webhooks. You can get if from Stripe Dashboard. If you don't use subscription & recurring payment it's not necessary.
  • Currency: Currency code of order (USD, EUR, etc..., see Stripe docs for the full list). Its default value is USD.
  • Locale: Language of the order. Its default value is 'auto'.
  • PaymentMethodTypes: A list of the types of payment methods (e.g., card) this Checkout session can accept. See https://stripe.com/docs/payments/checkout/payment-methods. Its default value is 'card'.

StripeWebOptions

StripeWebOptions is used to configure Stripe payment gateway web options.

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.

PayPalOptions

PayPalOptions is used to configure PayPal payment gateway options.

  • ClientId: Client Id for the PayPal account.
  • Secret Secret for the PayPal account.
  • CurrencyCode: Currency code of order (USD, EUR, etc...).
  • Environment: Payment environment. ("Sandbox" or "Live", default value is "Sandbox")
  • Locale: PayPal-supported language and locale to localize PayPal checkout pages. See https://developer.paypal.com/docs/api/reference/locale-codes/.

PayPalWebOptions

PayPalWebOptions is used to configure PayPal payment gateway web options.

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.

IyzicoOptions

IyzicoOptions is used to configure Iyzico payment gateway options.

  • BaseUrl: Base API URL for the Iyzico (ex: https://sandbox-api.iyzipay.com).
  • ApiKey Api key for the Iyzico account.
  • SecretKey Secret for the Iyzico account.
  • Currency: Currency code for the order (USD, EUR, GBP and TRY can be used).
  • Locale: Language of the order.
  • InstallmentCount: Installment count value. For single installment payments it should be 1 (valid values: 1, 2, 3, 6, 9, 12).

IyzicoWebOptions

IyzicoWebOptions is used to configure Iyzico payment gateway web options.

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.
  • PrePaymentCheckoutButtonStyle: CSS style to add Checkout button on Iyzico prepayment page. This class can be used for tracking user activity via 3rd party tools like Google Tag Manager.

AlipayOptions

AlipayOptions is used to configure Alipay payment gateway options。 Alipay gateway only supports CNY currency.

  • Protocol：Protocol for the Alipay (ex: https).
  • GatewayHost: Gateway host for the Aliapy.
  • SignType: Sign type for the Alipay.
  • AppId: AppId for the Alipay account.
  • MerchantPrivateKey: Merchant private key of the Alipay account.
  • MerchantCertPathMerchant cert path of the Alipay account.
  • AlipayCertPath: Alipay cert path of the Alipay account.
  • AlipayRootCertPath: Alipay root cert path of the Alipay account.
  • AlipayPublicKey: Alipay public key of the Alipay account.
  • NotifyUrl: Notify url of the Alipay.
  • EncryptKey: Encrypt key of the Alipay.

AlipayWebOptions

  • Recommended: Is payment gateway is recommended or not. This information is displayed on payment gateway selection page.
  • ExtraInfos: List of informative strings for payment gateway. These texts are displayed on payment gateway selection page.
  • PrePaymentCheckoutButtonStyle: CSS style to add Checkout button on Iyzico prepayment page. This class can be used for tracking user activity via 3rd party tools like Google Tag Manager.

You can check the Alipay document for more details.

Instead of configuring options in your module class, you can configure it in your appsettings.json file like below;

"Payment": {
    "Payu": {
      "Merchant": "TEST",
      "Signature": "SECRET_KEY",
      "LanguageCode": "en",
      "CurrencyCode": "USD",
      "VatRate": "0",
      "PriceType": "GROSS",
      "Shipping": "0",
      "Installment": "1",
      "TestOrder": "1",
      "Debug": "1"
    },
    "TwoCheckout": {
      "Signature": "SECRET_KEY",
      "CheckoutUrl": "https://secure.2checkout.com/order/checkout.php",
      "LanguageCode": "en",
      "CurrencyCode": "USD",
      "TestOrder": "1"
    },
    "PayPal": {
      "ClientId": "CLIENT_ID",
      "Secret": "SECRET",
      "CurrencyCode": "USD",
      "Environment": "Sandbox",
      "Locale": "en_US"
    },
    "Stripe": {
      "PublishableKey": "PUBLISHABLE_KEY",
      "SecretKey": "SECRET_KEY",
      "PaymentMethodTypes": ["alipay"]
    },
    "Iyzico": {
      "ApiKey": "API_KEY",
      "SecretKey": "SECRET_KEY",
      "BaseUrl": "https://sandbox-api.iyzipay.com",
      "Locale": "en",
      "Currency": "USD"
    },
    "Alipay": {
      "AppId": "APP_ID",
      "GatewayHost": "openapi.alipaydev.com",
      "AlipayPublicKey": "ALIPAY_PUBLIC_KEY",
      "MerchantPrivateKey": "MERCHANT_PRIVATE_KEY"
    }
  }

Internals

Domain layer

Aggregates

This module follows the Entity Best Practices & Conventions guide.

PaymentRequest

A payment request represents a request for a payment in the application.

  • PaymentRequest (aggregate root): Represents a payment request in the system.
    • Products (collection): List of products for payment request.
    • State : State of payment request (can be Waiting, Completed, Failed or Refunded).
    • Currency : Currency code of payment request (USD, EUR, etc...).
    • Gateway : Name of payment gateway used for this payment request.
    • FailReason: Reason for failed payment requests.
Plan

A plan is used for subscription payments. Contains PlanGateway list to configure each gateway.

  • Plan (aggregate root): Represents a plan for recurring payments.
    • PlanGateways (collection): List of gateway plans.
    • Name : An optional name of plan.
  • GatewayPlan (entity): Represents a gateway configuration for a plan.
    • PlanId: Represents a plan belong to.
    • Gateway: Represents a gateway belong to. It has to be unique.
    • ExternalId: Stores a unique configuration of gateway for subscrtiption, such as priceId, planId, subscriptionId or productId etc.

Repositories

This module follows the Repository Best Practices & Conventions guide.

Following custom repositories are defined for this module:

  • IPaymentRequestRepository
  • IPlanRepository

Application layer

Application services

  • PaymentRequestAppService (implements IPaymentRequestAppService): Used to create payment requests and access payment request details.
  • GatewayAppService (implements IGatewayAppService): Used to provide payment gateway list to UI.
  • PlanAppService (implements IPlanAppService): Used to manage Subscription Plans.

Database providers

Common

Table / collection prefix & schema

All tables/collections use the Pay prefix by default. Set static properties on the PaymentDbProperties class if you need to change the table prefix or set a schema name (if supported by your database provider).

Connection string

This module uses AbpPayment for the connection string name. If you don't define a connection string with this name, it fallbacks to the Default connection string.

See the connection strings documentation for details.

Entity Framework Core

Tables
  • PayPaymentRequests
    • AbpRoleClaims
      • PayPaymentRequestProducts
  • PayPlans
  • PayGatewayPlans

MongoDB

Collections
  • PayPaymentRequests
  • PayPlans

Entity Extensions

Module entity extension system is a high-level extension system that allows you to define new properties for existing entities of the dependent modules. It automatically adds properties to the entity, database, HTTP API and user interface in a single point.

To extend entities of the payment module, open your YourProjectNameModuleExtensionConfigurator class inside of your DomainShared project and change the ConfigureExtraProperties method like shown below.

public static void ConfigureExtraProperties()
{
    OneTimeRunner.Run(() =>
    {
        ObjectExtensionManager.Instance.Modules()
            .ConfigurePayment(payment =>
            {
                payment.ConfigurePlan(plan => // extend the Plan entity
                {
                    plan.AddOrUpdateProperty<string>( //property type: string
                      "PlanDescription", //property name
                      property => {
                        //validation rules
                        property.Attributes.Add(new RequiredAttribute()); //adds required attribute to the defined property

                        //...other configurations for this property
                      }
                    );
                });
              
              payment.ConfigureGatewayPlan(gatewayPlan => // extend the GatewayPlan entity
                {
                    gatewayPlan.AddOrUpdateProperty<string>( //property type: string
                      "GatewayPlanDescription", //property name
                      property => {
                        //validation rules
                        property.Attributes.Add(new RequiredAttribute()); //adds required attribute to the defined property
                        property.Attributes.Add(
                          new StringLengthAttribute(MyConsts.MaximumDescriptionLength) {
                            MinimumLength = MyConsts.MinimumDescriptionLength
                          }
                        );

                        //...other configurations for this property
                      }
                    );
                });     
            });
    });
}

  • ConfigurePayment(...) method is used to configure the entities of the payment module.

  • payment.ConfigurePlan(...) is used to configure the Plan entity of the payment module. You can add or update your extra properties of the Plan entity.

  • payment.ConfigureGatewayPlan(...) is used to configure the GatewayPlan entity of the payment module. You can add or update your extra properties of the GatewayPlan entity.

  • You can also set some validation rules for the property that you defined. In the above sample, RequiredAttribute and StringLengthAttribute were added for the property named "GatewayPlanDescription".

  • When you define the new property, it will automatically add to Entity, HTTP API and UI for you.

    • Once you define a property, it appears in the create and update forms of the related entity.
    • New properties also appear in the datatable of the related page.

Distributed Events

  • Volo.Payment.PaymentRequestCompleted (PaymentRequestCompletedEto): Published when a payment is completed.

    • Id: Represents PaymentRequest entity Id.
    • Gateway: Represents the gateway which payment was done with.
    • Currency: Represents the currency of payment.
    • Products (collection): Represents which products are included in PaymentRequest.

  • Volo.Payment.SubscriptionCanceled (SubscriptionCanceledEto): Published when a subscription is stopped or canceled.

    • PaymentRequestId: Represents PaymentRequest entity Id.
    • State: Represents state of PaymentRequest, such as Waiting, Completed, Failed or Refunded.
    • Currency: Represents the currency of payment.
    • Gateway: Represents the gateway which payment was done with.
    • FailReason: Represents a fail reason which is provided by gateway.
    • ExternalSubscriptionId: Represents subscription Id of Gateway.
    • PeriodEndDate: Represents end date of subscription. Subscriptions may canceled but lasts until end of last period.

  • Volo.Payment.SubscriptionCreated (SubscriptionCreatedEto): Published when a subscription is created.

    • PaymentRequestId: Represents PaymentRequest entity Id.
    • State: Represents state of PaymentRequest, such as Waiting, Completed, Failed or Refunded.
    • Currency: Represents the currency of payment.
    • Gateway: Represents the gateway which payment was done with.
    • ExternalSubscriptionId: Represents subscription Id of Gateway.
    • PeriodEndDate: Represents end date of subscription. Subscriptions may canceled but lasts until end of last period.

  • Volo.Payment.RecurringPaymentUpdated (SubscriptionUpdatedEto): Published when a subscription is updated in application or in payment gateway dashboard. If subscription is updated from gateway dashboard, this event will be published right after webhook delivery.

    • PaymentRequestId: Represents PaymentRequest entity Id.
    • State: Represents state of PaymentRequest, such as Waiting, Completed, Failed or Refunded.
    • Currency: Represents the currency of payment.
    • Gateway: Represents the gateway which payment was done with.
    • ExternalSubscriptionId: Represents subscription Id of Gateway.
    • PeriodEndDate: Represents end date of subscription. Subscriptions may canceled but lasts until end of last period.

Couldn't find what you need? Check out the standard distributed events.

One-Time Payments

This module implements one-time payments;

You can get one-time payments from your customers using one or more payment gateways supported by the payment module. Payment module works in a very simple way for one-time payments. It creates a local payment request record and redirects customer to payment gateway (PayPal, Stripe etc...) for processing the payment. When the customer pays on the payment gateway, payment module handles the external payment gateway's response and validates the payment to see if it is really paid or not. If the payment is validated, payment module redirects customer to main application which initiated the payment process at the beginning.

Image below demonstrates the flow of a payment process;

payment-module-flow

Each payment gateway implementation contains PrePayment and PostPayment pages.

PrePayment page asks users for extra information if requested by the external payment gateway. For example, 2Checkout doesn't require any extra information, so PrePayment page for 2Checkout redirects user to 2Checkout without asking any extra information.

PostPayment page is responsible for validation of the response of the external payment gateway. When a user completes the payment, user is redirected to PostPayment page for that payment gateway and PostPayment page validates the status of the payment. If the payment is succeeded, status of the payment request is updated and user is redirected to main application.

Note: It is main application's responsibility to handle if a payment request is used more than one time. For example if PostPayment page generates a URL like https://mywebsite.com/PaymentSucceed?PaymentRequestId={PaymentRequestId}, this URL can be visited more than onec manually by end users. If you already delivered your product for a given PaymentRequestId, you shouldn't deliver it when this URL is visited second time.

Creating One-Time Payment

In order to initiate a payment process, inject IPaymentRequestAppService, create a payment request using it's CreateAsync method and redirect user to gateway selection page with the created payment request's Id. Here is a sample Razor Page code which starts a payment process on it's OnPost method.

Redirection of the gateway selection page has to be a POST request. If you implement it as a GET request, you will get an error. You can use LocalRedirectPreserveMethod to keep the method as POST in the redirected request.

public class IndexModel: PageModel
{
    private readonly IPaymentRequestAppService _paymentRequestAppService;

    public IndexModel(IPaymentRequestAppService paymentRequestAppService)
    {
        _paymentRequestAppService = paymentRequestAppService;
    }

    public virtual async Task<IActionResult> OnPostAsync()
    {
        var paymentRequest = await _paymentRequestAppService.CreateAsync(new PaymentRequestCreateDto()
        {
            Currency= "USD",
            Products = new List<PaymentRequestProductCreateDto>()
            {
                new PaymentRequestProductCreateDto
                {
                    Code = "Product_01",
                    Name = "LEGO Super Mario",
                    Count = 2,
                    UnitPrice = 60,
                    TotalPrice = 200
                }
            }
        });
        
        return LocalRedirectPreserveMethod("/Payment/GatewaySelection?paymentRequestId=" + paymentRequest.Id);
    }
}

If the payment is successful, payment module will return to configured PaymentWebOptions.CallbackUrl. The main application can take necessary actions for a successful payment (Activating a user account, triggering a shipment start process etc...).

Subscriptions

This module also implements recurring payments;

  • Supports only Stripe for now.

You can start a subscription and get recurring payment from your customers using payment gateways supported by this module. It works different from one-time payment. Payment module works with events over webhooks of selected gateway. It creates a local payment request record like one-time payment, but it tracks that payment request in every period that customer pays and publishes events for cancels, updates and continues.

payment-module-flow

Enabling WebHooks

Configuring Web Hooks is highly important for subscriptions otherwise your application won't be able to get subscription changes, such as canceled or updated states. Each gateway has its own configuration:

Stripe

  1. Go to WebHooks on Stripe Dashboard
  2. Create a new webhook via using Add endpoint button.
    • Endpoint URL: yourdomain.com/api/payment/stripe/webhook
    • Events to send:
      • customer.subscription.created
      • customer.subscription.deleted
      • customer.subscription.updated
      • checkout.session.completed (optional) If you don't set this, payment will be proceed with callback.
  3. Stripe will create a webhook secret key. Copy that and configure it as WebhookSecret under StripeOptions.

Configuring Plans

Before starting a recurring payment, Plan and GatewayPlan must be configured properly.

  1. Go to your payment gateway (Stripe) dashboard and create product & pricing.
  2. Create a Plan entity in your application.
  3. Go to 'Manage Gateway Plans' section and create a new GatewayPlan for gateway and paste price or product id as ExternalId.

Creating a Tenant-Edition Subscription

Follow saas documentation.

Creating a Recurring Payment

Creating a recurring payment almost same as creating a payment. Setting PaymentType property as Recurring and passing PlanId are enough to start a recurring payment request. If given Plan has multiple GatewayPlan, user will be able to choose gateway to pay.

Redirection of the gateway selection page has to be a POST request. If you implement it as a GET request, you will get an error. You can use LocalRedirectPreserveMethod to keep the method as POST in the redirected request.

public class SubscriptionModel : PageModel
{
    private IPaymentRequestAppService PaymentRequestAppService { get; }

    public SubscriptionModel(IPaymentRequestAppService paymentRequestAppService)
    {
        PaymentRequestAppService = paymentRequestAppService;
    }

    public virtual async Task<IActionResult> OnPostAsync()
    {
        var paymentRequest = await PaymentRequestAppService.CreateAsync(
            new PaymentRequestCreateDto()
            {
                Products =
                {
                    new PaymentRequestProductCreateDto
                    {
                        PaymentType = PaymentType.Subscription,
                        Name = "Enterprise Plan",
                        Code = "EP",
                        Count = 1,
                        // Place your created PlanId below.
                        PlanId = DemoAppData.Plan_2_Id, 
                    }
                }
            });

        return LocalRedirectPreserveMethod("/Payment/GatewaySelection?paymentRequestId=" + paymentRequest.Id);
    }
}

To track that subscription is continuing or canceled, you should keep the SubscriptionId, all events contain it.

Contributors

Avatar dgnyldrm7 Avatar hikalkan
Last updated: August 26, 2024 Edit this page on GitHub

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